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<!DOCTYPE html>
<html lang="en" class="RFC">
<head>
<meta charset="utf-8">
<meta content="Common,Latin" name="scripts">
<meta content="initial-scale=1.0" name="viewport">
<title>RFC 8859: A Framework for Session Description Protocol (SDP) Attributes When Multiplexing</title>
<meta content="Suhas Nandakumar" name="author">
<meta content="
       The purpose of this specification is to provide a framework
      for analyzing the multiplexing characteristics of Session Description
      Protocol (SDP) attributes when SDP is used to negotiate the usage of a
      single 5-tuple for sending and receiving media associated with multiple
      media descriptions. 
       This specification also categorizes the existing SDP attributes based
      on the framework described herein. 
    " name="description">
<meta content="xml2rfc 3.5.0" name="generator">
<meta content="8859" name="rfc.number">
<!-- Generator version information:
  xml2rfc 3.5.0
    Python 3.6.10
    appdirs 1.4.4
    ConfigArgParse 1.2.3
    google-i18n-address 2.3.5
    html5lib 1.0.1
    intervaltree 3.0.2
    Jinja2 2.11.2
    kitchen 1.2.6
    lxml 4.4.2
    pycairo 1.19.0
    pycountry 19.8.18
    pyflakes 2.1.1
    PyYAML 5.3.1
    requests 2.22.0
    setuptools 40.6.2
    six 1.14.0
    WeasyPrint 51
-->
<link href="rfc8859.xml" rel="alternate" type="application/rfc+xml">
<link href="#copyright" rel="license">
<style type="text/css">/*

  NOTE: Changes at the bottom of this file overrides some earlier settings.

  Once the style has stabilized and has been adopted as an official RFC style,
  this can be consolidated so that style settings occur only in one place, but
  for now the contents of this file consists first of the initial CSS work as
  provided to the RFC Formatter (xml2rfc) work, followed by itemized and
  commented changes found necssary during the development of the v3
  formatters.

*/

/* fonts */
@import url('https://fonts.googleapis.com/css?family=Noto+Sans'); /* Sans-serif */
@import url('https://fonts.googleapis.com/css?family=Noto+Serif'); /* Serif (print) */
@import url('https://fonts.googleapis.com/css?family=Roboto+Mono'); /* Monospace */

@viewport {
  zoom: 1.0;
  width: extend-to-zoom;
}
@-ms-viewport {
  width: extend-to-zoom;
  zoom: 1.0;
}
/* general and mobile first */
html {
}
body {
  max-width: 90%;
  margin: 1.5em auto;
  color: #222;
  background-color: #fff;
  font-size: 14px;
  font-family: 'Noto Sans', Arial, Helvetica, sans-serif;
  line-height: 1.6;
  scroll-behavior: smooth;
}
.ears {
  display: none;
}

/* headings */
#title, h1, h2, h3, h4, h5, h6 {
  margin: 1em 0 0.5em;
  font-weight: bold;
  line-height: 1.3;
}
#title {
  clear: both;
  border-bottom: 1px solid #ddd;
  margin: 0 0 0.5em 0;
  padding: 1em 0 0.5em;
}
.author {
  padding-bottom: 4px;
}
h1 {
  font-size: 26px;
  margin: 1em 0;
}
h2 {
  font-size: 22px;
  margin-top: -20px;  /* provide offset for in-page anchors */
  padding-top: 33px;
}
h3 {
  font-size: 18px;
  margin-top: -36px;  /* provide offset for in-page anchors */
  padding-top: 42px;
}
h4 {
  font-size: 16px;
  margin-top: -36px;  /* provide offset for in-page anchors */
  padding-top: 42px;
}
h5, h6 {
  font-size: 14px;
}
#n-copyright-notice {
  border-bottom: 1px solid #ddd;
  padding-bottom: 1em;
  margin-bottom: 1em;
}
/* general structure */
p {
  padding: 0;
  margin: 0 0 1em 0;
  text-align: left;
}
div, span {
  position: relative;
}
div {
  margin: 0;
}
.alignRight.art-text {
  background-color: #f9f9f9;
  border: 1px solid #eee;
  border-radius: 3px;
  padding: 1em 1em 0;
  margin-bottom: 1.5em;
}
.alignRight.art-text pre {
  padding: 0;
}
.alignRight {
  margin: 1em 0;
}
.alignRight > *:first-child {
  border: none;
  margin: 0;
  float: right;
  clear: both;
}
.alignRight > *:nth-child(2) {
  clear: both;
  display: block;
  border: none;
}
svg {
  display: block;
}
.alignCenter.art-text {
  background-color: #f9f9f9;
  border: 1px solid #eee;
  border-radius: 3px;
  padding: 1em 1em 0;
  margin-bottom: 1.5em;
}
.alignCenter.art-text pre {
  padding: 0;
}
.alignCenter {
  margin: 1em 0;
}
.alignCenter > *:first-child {
  border: none;
  /* this isn't optimal, but it's an existence proof.  PrinceXML doesn't
     support flexbox yet.
  */
  display: table;
  margin: 0 auto;
}

/* lists */
ol, ul {
  padding: 0;
  margin: 0 0 1em 2em;
}
ol ol, ul ul, ol ul, ul ol {
  margin-left: 1em;
}
li {
  margin: 0 0 0.25em 0;
}
.ulCompact li {
  margin: 0;
}
ul.empty, .ulEmpty {
  list-style-type: none;
}
ul.empty li, .ulEmpty li {
  margin-top: 0.5em;
}
ul.compact, .ulCompact,
ol.compact, .olCompact {
  line-height: 100%;
  margin: 0 0 0 2em;
}

/* definition lists */
dl {
}
dl > dt {
  float: left;
  margin-right: 1em;
}
/* 
dl.nohang > dt {
  float: none;
}
*/
dl > dd {
  margin-bottom: .8em;
  min-height: 1.3em;
}
dl.compact > dd, .dlCompact > dd {
  margin-bottom: 0em;
}
dl > dd > dl {
  margin-top: 0.5em;
  margin-bottom: 0em;
}

/* links */
a {
  text-decoration: none;
}
a[href] {
  color: #22e; /* Arlen: WCAG 2019 */
}
a[href]:hover {
  background-color: #f2f2f2;
}
figcaption a[href],
a[href].selfRef {
  color: #222;
}
/* XXX probably not this:
a.selfRef:hover {
  background-color: transparent;
  cursor: default;
} */

/* Figures */
tt, code, pre, code {
  background-color: #f9f9f9;
  font-family: 'Roboto Mono', monospace;
}
pre {
  border: 1px solid #eee;
  margin: 0;
  padding: 1em;
}
img {
  max-width: 100%;
}
figure {
  margin: 0;
}
figure blockquote {
  margin: 0.8em 0.4em 0.4em;
}
figcaption {
  font-style: italic;
  margin: 0 0 1em 0;
}
@media screen {
  pre {
    overflow-x: auto;
    max-width: 100%;
    max-width: calc(100% - 22px);
  }
}

/* aside, blockquote */
aside, blockquote {
  margin-left: 0;
  padding: 1.2em 2em;
}
blockquote {
  background-color: #f9f9f9;
  color: #111; /* Arlen: WCAG 2019 */
  border: 1px solid #ddd;
  border-radius: 3px;
  margin: 1em 0;
}
cite {
  display: block;
  text-align: right;
  font-style: italic;
}

/* tables */
table {
  width: 100%;
  margin: 0 0 1em;
  border-collapse: collapse;
  border: 1px solid #eee;
}
th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.5em 0.75em;
}
th {
  text-align: left;
  background-color: #e9e9e9;
}
tr:nth-child(2n+1) > td {
  background-color: #f5f5f5;
}
table caption {
  font-style: italic;
  margin: 0;
  padding: 0;
  text-align: left;
}
table p {
  /* XXX to avoid bottom margin on table row signifiers. If paragraphs should
     be allowed within tables more generally, it would be far better to select on a class. */
  margin: 0;
}

/* pilcrow */
a.pilcrow {
  color: #666; /* Arlen: AHDJ 2019 */
  text-decoration: none;
  visibility: hidden;
  user-select: none;
  -ms-user-select: none;
  -o-user-select:none;
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}
@media screen {
  aside:hover > a.pilcrow,
  p:hover > a.pilcrow,
  blockquote:hover > a.pilcrow,
  div:hover > a.pilcrow,
  li:hover > a.pilcrow,
  pre:hover > a.pilcrow {
    visibility: visible;
  }
  a.pilcrow:hover {
    background-color: transparent;
  }
}

/* misc */
hr {
  border: 0;
  border-top: 1px solid #eee;
}
.bcp14 {
  font-variant: small-caps;
}

.role {
  font-variant: all-small-caps;
}

/* info block */
#identifiers {
  margin: 0;
  font-size: 0.9em;
}
#identifiers dt {
  width: 3em;
  clear: left;
}
#identifiers dd {
  float: left;
  margin-bottom: 0;
}
#identifiers .authors .author {
  display: inline-block;
  margin-right: 1.5em;
}
#identifiers .authors .org {
  font-style: italic;
}

/* The prepared/rendered info at the very bottom of the page */
.docInfo {
  color: #666; /* Arlen: WCAG 2019 */
  font-size: 0.9em;
  font-style: italic;
  margin-top: 2em;
}
.docInfo .prepared {
  float: left;
}
.docInfo .prepared {
  float: right;
}

/* table of contents */
#toc  {
  padding: 0.75em 0 2em 0;
  margin-bottom: 1em;
}
nav.toc ul {
  margin: 0 0.5em 0 0;
  padding: 0;
  list-style: none;
}
nav.toc li {
  line-height: 1.3em;
  margin: 0.75em 0;
  padding-left: 1.2em;
  text-indent: -1.2em;
}
/* references */
.references dt {
  text-align: right;
  font-weight: bold;
  min-width: 7em;
}
.references dd {
  margin-left: 8em;
  overflow: auto;
}

.refInstance {
  margin-bottom: 1.25em;
}

.references .ascii {
  margin-bottom: 0.25em;
}

/* index */
.index ul {
  margin: 0 0 0 1em;
  padding: 0;
  list-style: none;
}
.index ul ul {
  margin: 0;
}
.index li {
  margin: 0;
  text-indent: -2em;
  padding-left: 2em;
  padding-bottom: 5px;
}
.indexIndex {
  margin: 0.5em 0 1em;
}
.index a {
  font-weight: 700;
}
/* make the index two-column on all but the smallest screens */
@media (min-width: 600px) {
  .index ul {
    -moz-column-count: 2;
    -moz-column-gap: 20px;
  }
  .index ul ul {
    -moz-column-count: 1;
    -moz-column-gap: 0;
  }
}

/* authors */
address.vcard {
  font-style: normal;
  margin: 1em 0;
}

address.vcard .nameRole {
  font-weight: 700;
  margin-left: 0;
}
address.vcard .label {
  font-family: "Noto Sans",Arial,Helvetica,sans-serif;
  margin: 0.5em 0;
}
address.vcard .type {
  display: none;
}
.alternative-contact {
  margin: 1.5em 0 1em;
}
hr.addr {
  border-top: 1px dashed;
  margin: 0;
  color: #ddd;
  max-width: calc(100% - 16px);
}

/* temporary notes */
.rfcEditorRemove::before {
  position: absolute;
  top: 0.2em;
  right: 0.2em;
  padding: 0.2em;
  content: "The RFC Editor will remove this note";
  color: #9e2a00; /* Arlen: WCAG 2019 */
  background-color: #ffd; /* Arlen: WCAG 2019 */
}
.rfcEditorRemove {
  position: relative;
  padding-top: 1.8em;
  background-color: #ffd; /* Arlen: WCAG 2019 */
  border-radius: 3px;
}
.cref {
  background-color: #ffd; /* Arlen: WCAG 2019 */
  padding: 2px 4px;
}
.crefSource {
  font-style: italic;
}
/* alternative layout for smaller screens */
@media screen and (max-width: 1023px) {
  body {
    padding-top: 2em;
  }
  #title {
    padding: 1em 0;
  }
  h1 {
    font-size: 24px;
  }
  h2 {
    font-size: 20px;
    margin-top: -18px;  /* provide offset for in-page anchors */
    padding-top: 38px;
  }
  #identifiers dd {
    max-width: 60%;
  }
  #toc {
    position: fixed;
    z-index: 2;
    top: 0;
    right: 0;
    padding: 0;
    margin: 0;
    background-color: inherit;
    border-bottom: 1px solid #ccc;
  }
  #toc h2 {
    margin: -1px 0 0 0;
    padding: 4px 0 4px 6px;
    padding-right: 1em;
    min-width: 190px;
    font-size: 1.1em;
    text-align: right;
    background-color: #444;
    color: white;
    cursor: pointer;
  }
  #toc h2::before { /* css hamburger */
    float: right;
    position: relative;
    width: 1em;
    height: 1px;
    left: -164px;
    margin: 6px 0 0 0;
    background: white none repeat scroll 0 0;
    box-shadow: 0 4px 0 0 white, 0 8px 0 0 white;
    content: "";
  }
  #toc nav {
    display: none;
    padding: 0.5em 1em 1em;
    overflow: auto;
    height: calc(100vh - 48px);
    border-left: 1px solid #ddd;
  }
}

/* alternative layout for wide screens */
@media screen and (min-width: 1024px) {
  body {
    max-width: 724px;
    margin: 42px auto;
    padding-left: 1.5em;
    padding-right: 29em;
  }
  #toc {
    position: fixed;
    top: 42px;
    right: 42px;
    width: 25%;
    margin: 0;
    padding: 0 1em;
    z-index: 1;
  }
  #toc h2 {
    border-top: none;
    border-bottom: 1px solid #ddd;
    font-size: 1em;
    font-weight: normal;
    margin: 0;
    padding: 0.25em 1em 1em 0;
  }
  #toc nav {
    display: block;
    height: calc(90vh - 84px);
    bottom: 0;
    padding: 0.5em 0 0;
    overflow: auto;
  }
  img { /* future proofing */
    max-width: 100%;
    height: auto;
  }
}

/* pagination */
@media print {
  body {

    width: 100%;
  }
  p {
    orphans: 3;
    widows: 3;
  }
  #n-copyright-notice {
    border-bottom: none;
  }
  #toc, #n-introduction {
    page-break-before: always;
  }
  #toc {
    border-top: none;
    padding-top: 0;
  }
  figure, pre {
    page-break-inside: avoid;
  }
  figure {
    overflow: scroll;
  }
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  h2+*, h3+*, h4+*, h5+*, h6+* {
    page-break-before: avoid;
  }
  pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 10pt;
  }
  table {
    border: 1px solid #ddd;
  }
  td {
    border-top: 1px solid #ddd;
  }
}

/* This is commented out here, as the string-set: doesn't
   pass W3C validation currently */
/*
.ears thead .left {
  string-set: ears-top-left content();
}

.ears thead .center {
  string-set: ears-top-center content();
}

.ears thead .right {
  string-set: ears-top-right content();
}

.ears tfoot .left {
  string-set: ears-bottom-left content();
}

.ears tfoot .center {
  string-set: ears-bottom-center content();
}

.ears tfoot .right {
  string-set: ears-bottom-right content();
}
*/

@page :first {
  padding-top: 0;
  @top-left {
    content: normal;
    border: none;
  }
  @top-center {
    content: normal;
    border: none;
  }
  @top-right {
    content: normal;
    border: none;
  }
}

@page {
  size: A4;
  margin-bottom: 45mm;
  padding-top: 20px;
  /* The follwing is commented out here, but set appropriately by in code, as
     the content depends on the document */
  /*
  @top-left {
    content: 'Internet-Draft';
    vertical-align: bottom;
    border-bottom: solid 1px #ccc;
  }
  @top-left {
    content: string(ears-top-left);
    vertical-align: bottom;
    border-bottom: solid 1px #ccc;
  }
  @top-center {
    content: string(ears-top-center);
    vertical-align: bottom;
    border-bottom: solid 1px #ccc;
  }
  @top-right {
    content: string(ears-top-right);
    vertical-align: bottom;
    border-bottom: solid 1px #ccc;
  }
  @bottom-left {
    content: string(ears-bottom-left);
    vertical-align: top;
    border-top: solid 1px #ccc;
  }
  @bottom-center {
    content: string(ears-bottom-center);
    vertical-align: top;
    border-top: solid 1px #ccc;
  }
  @bottom-right {
      content: '[Page ' counter(page) ']';
      vertical-align: top;
      border-top: solid 1px #ccc;
  }
  */

}

/* Changes introduced to fix issues found during implementation */
/* Make sure links are clickable even if overlapped by following H* */
a {
  z-index: 2;
}
/* Separate body from document info even without intervening H1 */
section {
  clear: both;
}


/* Top align author divs, to avoid names without organization dropping level with org names */
.author {
  vertical-align: top;
}

/* Leave room in document info to show Internet-Draft on one line */
#identifiers dt {
  width: 8em;
}

/* Don't waste quite as much whitespace between label and value in doc info */
#identifiers dd {
  margin-left: 1em;
}

/* Give floating toc a background color (needed when it's a div inside section */
#toc {
  background-color: white;
}

/* Make the collapsed ToC header render white on gray also when it's a link */
@media screen and (max-width: 1023px) {
  #toc h2 a,
  #toc h2 a:link,
  #toc h2 a:focus,
  #toc h2 a:hover,
  #toc a.toplink,
  #toc a.toplink:hover {
    color: white;
    background-color: #444;
    text-decoration: none;
  }
}

/* Give the bottom of the ToC some whitespace */
@media screen and (min-width: 1024px) {
  #toc {
    padding: 0 0 1em 1em;
  }
}

/* Style section numbers with more space between number and title */
.section-number {
  padding-right: 0.5em;
}

/* prevent monospace from becoming overly large */
tt, code, pre, code {
  font-size: 95%;
}

/* Fix the height/width aspect for ascii art*/
pre.sourcecode,
.art-text pre {
  line-height: 1.12;
}


/* Add styling for a link in the ToC that points to the top of the document */
a.toplink {
  float: right;
  margin-right: 0.5em;
}

/* Fix the dl styling to match the RFC 7992 attributes */
dl > dt,
dl.dlParallel > dt {
  float: left;
  margin-right: 1em;
}
dl.dlNewline > dt {
  float: none;
}

/* Provide styling for table cell text alignment */
table td.text-left,
table th.text-left {
  text-align: left;
}
table td.text-center,
table th.text-center {
  text-align: center;
}
table td.text-right,
table th.text-right {
  text-align: right;
}

/* Make the alternative author contact informatio look less like just another
   author, and group it closer with the primary author contact information */
.alternative-contact {
  margin: 0.5em 0 0.25em 0;
}
address .non-ascii {
  margin: 0 0 0 2em;
}

/* With it being possible to set tables with alignment
  left, center, and right, { width: 100%; } does not make sense */
table {
  width: auto;
}

/* Avoid reference text that sits in a block with very wide left margin,
   because of a long floating dt label.*/
.references dd {
  overflow: visible;
}

/* Control caption placement */
caption {
  caption-side: bottom;
}

/* Limit the width of the author address vcard, so names in right-to-left
   script don't end up on the other side of the page. */

address.vcard {
  max-width: 30em;
  margin-right: auto;
}

/* For address alignment dependent on LTR or RTL scripts */
address div.left {
  text-align: left;
}
address div.right {
  text-align: right;
}

/* Provide table alignment support.  We can't use the alignX classes above
   since they do unwanted things with caption and other styling. */
table.right {
 margin-left: auto;
 margin-right: 0;
}
table.center {
 margin-left: auto;
 margin-right: auto;
}
table.left {
 margin-left: 0;
 margin-right: auto;
}

/* Give the table caption label the same styling as the figcaption */
caption a[href] {
  color: #222;
}

@media print {
  .toplink {
    display: none;
  }

  /* avoid overwriting the top border line with the ToC header */
  #toc {
    padding-top: 1px;
  }

  /* Avoid page breaks inside dl and author address entries */
  .vcard {
    page-break-inside: avoid;
  }

}
/* Tweak the bcp14 keyword presentation */
.bcp14 {
  font-variant: small-caps;
  font-weight: bold;
  font-size: 0.9em;
}
/* Tweak the invisible space above H* in order not to overlay links in text above */
 h2 {
  margin-top: -18px;  /* provide offset for in-page anchors */
  padding-top: 31px;
 }
 h3 {
  margin-top: -18px;  /* provide offset for in-page anchors */
  padding-top: 24px;
 }
 h4 {
  margin-top: -18px;  /* provide offset for in-page anchors */
  padding-top: 24px;
 }
/* Float artwork pilcrow to the right */
@media screen {
  .artwork a.pilcrow {
    display: block;
    line-height: 0.7;
    margin-top: 0.15em;
  }
}
/* Make pilcrows on dd visible */
@media screen {
  dd:hover > a.pilcrow {
    visibility: visible;
  }
}
/* Make the placement of figcaption match that of a table's caption
   by removing the figure's added bottom margin */
.alignLeft.art-text,
.alignCenter.art-text,
.alignRight.art-text {
   margin-bottom: 0;
}
.alignLeft,
.alignCenter,
.alignRight {
  margin: 1em 0 0 0;
}
/* In print, the pilcrow won't show on hover, so prevent it from taking up space,
   possibly even requiring a new line */
@media print {
  a.pilcrow {
    display: none;
  }
}
/* Styling for the external metadata */
div#external-metadata {
  background-color: #eee;
  padding: 0.5em;
  margin-bottom: 0.5em;
  display: none;
}
div#internal-metadata {
  padding: 0.5em;                       /* to match the external-metadata padding */
}
/* Styling for title RFC Number */
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<table class="ears">
<thead><tr>
<td class="left">RFC 8859</td>
<td class="center">SDP Attribute Multiplexing</td>
<td class="right">January 2021</td>
</tr></thead>
<tfoot><tr>
<td class="left">Nandakumar</td>
<td class="center">Standards Track</td>
<td class="right">[Page]</td>
</tr></tfoot>
</table>
<div id="external-metadata" class="document-information"></div>
<div id="internal-metadata" class="document-information">
<dl id="identifiers">
<dt class="label-stream">Stream:</dt>
<dd class="stream">Internet Engineering Task Force (IETF)</dd>
<dt class="label-rfc">RFC:</dt>
<dd class="rfc"><a href="https://www.rfc-editor.org/rfc/rfc8859" class="eref">8859</a></dd>
<dt class="label-category">Category:</dt>
<dd class="category">Standards Track</dd>
<dt class="label-published">Published:</dt>
<dd class="published">
<time datetime="2021-01" class="published">January 2021</time>
    </dd>
<dt class="label-issn">ISSN:</dt>
<dd class="issn">2070-1721</dd>
<dt class="label-authors">Author:</dt>
<dd class="authors">
<div class="author">
      <div class="author-name">S. Nandakumar</div>
<div class="org">Cisco</div>
</div>
</dd>
</dl>
</div>
<h1 id="rfcnum">RFC 8859</h1>
<h1 id="title">A Framework for Session Description Protocol (SDP) Attributes When Multiplexing</h1>
<section id="section-abstract">
      <h2 id="abstract"><a href="#abstract" class="selfRef">Abstract</a></h2>
<p id="section-abstract-1">The purpose of this specification is to provide a framework
      for analyzing the multiplexing characteristics of Session Description
      Protocol (SDP) attributes when SDP is used to negotiate the usage of a
      single 5-tuple for sending and receiving media associated with multiple
      media descriptions.<a href="#section-abstract-1" class="pilcrow">¶</a></p>
<p id="section-abstract-2">This specification also categorizes the existing SDP attributes based
      on the framework described herein.<a href="#section-abstract-2" class="pilcrow">¶</a></p>
</section>
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<section id="section-boilerplate.1">
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            This is an Internet Standards Track document.<a href="#section-boilerplate.1-1" class="pilcrow">¶</a></p>
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            This document is a product of the Internet Engineering Task Force
            (IETF).  It represents the consensus of the IETF community.  It has
            received public review and has been approved for publication by
            the Internet Engineering Steering Group (IESG).  Further
            information on Internet Standards is available in Section 2 of 
            RFC 7841.<a href="#section-boilerplate.1-2" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-3">
            Information about the current status of this document, any
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<div id="toc">
<section id="section-toc.1">
        <a href="#" onclick="scroll(0,0)" class="toplink">▲</a><h2 id="name-table-of-contents">
<a href="#name-table-of-contents" class="section-name selfRef">Table of Contents</a>
        </h2>
<nav class="toc"><ul class="ulEmpty toc compact">
<li class="ulEmpty toc compact" id="section-toc.1-1.1">
            <p id="section-toc.1-1.1.1" class="keepWithNext"><a href="#section-1" class="xref">1</a>.  <a href="#name-introduction" class="xref">Introduction</a><a href="#section-toc.1-1.1.1" class="pilcrow">¶</a></p>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.2">
            <p id="section-toc.1-1.2.1" class="keepWithNext"><a href="#section-2" class="xref">2</a>.  <a href="#name-terminology" class="xref">Terminology</a><a href="#section-toc.1-1.2.1" class="pilcrow">¶</a></p>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.3">
            <p id="section-toc.1-1.3.1" class="keepWithNext"><a href="#section-3" class="xref">3</a>.  <a href="#name-motivation" class="xref">Motivation</a><a href="#section-toc.1-1.3.1" class="pilcrow">¶</a></p>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.4">
            <p id="section-toc.1-1.4.1"><a href="#section-4" class="xref">4</a>.  <a href="#name-sdp-attribute-analysis-fram" class="xref">SDP Attribute Analysis Framework</a><a href="#section-toc.1-1.4.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.4.2.1">
                <p id="section-toc.1-1.4.2.1.1"><a href="#section-4.1" class="xref">4.1</a>.  <a href="#name-category-normal" class="xref">Category: NORMAL</a><a href="#section-toc.1-1.4.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.2">
                <p id="section-toc.1-1.4.2.2.1"><a href="#section-4.2" class="xref">4.2</a>.  <a href="#name-category-caution" class="xref">Category: CAUTION</a><a href="#section-toc.1-1.4.2.2.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.3">
                <p id="section-toc.1-1.4.2.3.1"><a href="#section-4.3" class="xref">4.3</a>.  <a href="#name-category-identical" class="xref">Category: IDENTICAL</a><a href="#section-toc.1-1.4.2.3.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.4">
                <p id="section-toc.1-1.4.2.4.1"><a href="#section-4.4" class="xref">4.4</a>.  <a href="#name-category-sum" class="xref">Category: SUM</a><a href="#section-toc.1-1.4.2.4.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.5">
                <p id="section-toc.1-1.4.2.5.1"><a href="#section-4.5" class="xref">4.5</a>.  <a href="#name-category-transport" class="xref">Category: TRANSPORT</a><a href="#section-toc.1-1.4.2.5.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.6">
                <p id="section-toc.1-1.4.2.6.1"><a href="#section-4.6" class="xref">4.6</a>.  <a href="#name-category-inherit" class="xref">Category: INHERIT</a><a href="#section-toc.1-1.4.2.6.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.7">
                <p id="section-toc.1-1.4.2.7.1"><a href="#section-4.7" class="xref">4.7</a>.  <a href="#name-category-identical-per-pt" class="xref">Category: IDENTICAL-PER-PT</a><a href="#section-toc.1-1.4.2.7.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.8">
                <p id="section-toc.1-1.4.2.8.1"><a href="#section-4.8" class="xref">4.8</a>.  <a href="#name-category-special" class="xref">Category: SPECIAL</a><a href="#section-toc.1-1.4.2.8.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.4.2.9">
                <p id="section-toc.1-1.4.2.9.1"><a href="#section-4.9" class="xref">4.9</a>.  <a href="#name-category-tbd" class="xref">Category: TBD</a><a href="#section-toc.1-1.4.2.9.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.5">
            <p id="section-toc.1-1.5.1"><a href="#section-5" class="xref">5</a>.  <a href="#name-analysis-of-existing-attrib" class="xref">Analysis of Existing Attributes</a><a href="#section-toc.1-1.5.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.5.2.1">
                <p id="section-toc.1-1.5.2.1.1"><a href="#section-5.1" class="xref">5.1</a>.  <a href="#name-rfc-4566-sdp" class="xref">RFC 4566: SDP</a><a href="#section-toc.1-1.5.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.2">
                <p id="section-toc.1-1.5.2.2.1"><a href="#section-5.2" class="xref">5.2</a>.  <a href="#name-rfc-4585-rtp-avpf" class="xref">RFC 4585: RTP/AVPF</a><a href="#section-toc.1-1.5.2.2.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.3">
                <p id="section-toc.1-1.5.2.3.1"><a href="#section-5.3" class="xref">5.3</a>.  <a href="#name-rfc-5761-multiplexing-rtp-a" class="xref">RFC 5761: Multiplexing RTP and RTCP</a><a href="#section-toc.1-1.5.2.3.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.4">
                <p id="section-toc.1-1.5.2.4.1"><a href="#section-5.4" class="xref">5.4</a>.  <a href="#name-rfc-3312-integration-of-res" class="xref">RFC 3312: Integration of Resource Management and SIP</a><a href="#section-toc.1-1.5.2.4.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.5">
                <p id="section-toc.1-1.5.2.5.1"><a href="#section-5.5" class="xref">5.5</a>.  <a href="#name-rfc-4574-sdp-label-attribut" class="xref">RFC 4574: SDP "label" Attribute</a><a href="#section-toc.1-1.5.2.5.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.6">
                <p id="section-toc.1-1.5.2.6.1"><a href="#section-5.6" class="xref">5.6</a>.  <a href="#name-rfc-5432-qos-mechanism-sele" class="xref">RFC 5432: QoS Mechanism Selection in SDP</a><a href="#section-toc.1-1.5.2.6.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.7">
                <p id="section-toc.1-1.5.2.7.1"><a href="#section-5.7" class="xref">5.7</a>.  <a href="#name-rfc-4568-sdp-security-descr" class="xref">RFC 4568: SDP Security Descriptions</a><a href="#section-toc.1-1.5.2.7.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.8">
                <p id="section-toc.1-1.5.2.8.1"><a href="#section-5.8" class="xref">5.8</a>.  <a href="#name-rfc-5762-rtp-over-dccp" class="xref">RFC 5762: RTP over DCCP</a><a href="#section-toc.1-1.5.2.8.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.9">
                <p id="section-toc.1-1.5.2.9.1"><a href="#section-5.9" class="xref">5.9</a>.  <a href="#name-rfc-6773-dccp-udp-encapsula" class="xref">RFC 6773: DCCP-UDP Encapsulation</a><a href="#section-toc.1-1.5.2.9.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.10">
                <p id="section-toc.1-1.5.2.10.1"><a href="#section-5.10" class="xref">5.10</a>. <a href="#name-rfc-5506-reduced-size-rtcp-" class="xref">RFC 5506: Reduced-Size RTCP in RTP Profile</a><a href="#section-toc.1-1.5.2.10.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.11">
                <p id="section-toc.1-1.5.2.11.1"><a href="#section-5.11" class="xref">5.11</a>. <a href="#name-rfc-6787-media-resource-con" class="xref">RFC 6787: Media Resource Control Protocol Version 2</a><a href="#section-toc.1-1.5.2.11.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.12">
                <p id="section-toc.1-1.5.2.12.1"><a href="#section-5.12" class="xref">5.12</a>. <a href="#name-rfc-8445-ice" class="xref">RFC 8445: ICE</a><a href="#section-toc.1-1.5.2.12.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.13">
                <p id="section-toc.1-1.5.2.13.1"><a href="#section-5.13" class="xref">5.13</a>. <a href="#name-rfc-5285-rtp-header-extensi" class="xref">RFC 5285: RTP Header Extensions</a><a href="#section-toc.1-1.5.2.13.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.14">
                <p id="section-toc.1-1.5.2.14.1"><a href="#section-5.14" class="xref">5.14</a>. <a href="#name-rfc-3605-rtcp-attribute-in-" class="xref">RFC 3605: RTCP Attribute in SDP</a><a href="#section-toc.1-1.5.2.14.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.15">
                <p id="section-toc.1-1.5.2.15.1"><a href="#section-5.15" class="xref">5.15</a>. <a href="#name-rfc-5576-source-specific-sd" class="xref">RFC 5576: Source-Specific SDP Attributes</a><a href="#section-toc.1-1.5.2.15.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.16">
                <p id="section-toc.1-1.5.2.16.1"><a href="#section-5.16" class="xref">5.16</a>. <a href="#name-rfc-7273-rtp-clock-source-s" class="xref">RFC 7273: RTP Clock Source Signaling</a><a href="#section-toc.1-1.5.2.16.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.17">
                <p id="section-toc.1-1.5.2.17.1"><a href="#section-5.17" class="xref">5.17</a>. <a href="#name-rfc-6236-image-attributes-i" class="xref">RFC 6236: Image Attributes in SDP</a><a href="#section-toc.1-1.5.2.17.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.18">
                <p id="section-toc.1-1.5.2.18.1"><a href="#section-5.18" class="xref">5.18</a>. <a href="#name-rfc-7197-duplication-delay-" class="xref">RFC 7197: Duplication Delay Attribute in SDP</a><a href="#section-toc.1-1.5.2.18.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.19">
                <p id="section-toc.1-1.5.2.19.1"><a href="#section-5.19" class="xref">5.19</a>. <a href="#name-rfc-7266-rtcp-xr-blocks-for" class="xref">RFC 7266: RTCP XR Blocks for MOS Metric Reporting</a><a href="#section-toc.1-1.5.2.19.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.20">
                <p id="section-toc.1-1.5.2.20.1"><a href="#section-5.20" class="xref">5.20</a>. <a href="#name-rfc-6285-rapid-acquisition-" class="xref">RFC 6285: Rapid Acquisition of Multicast RTP Sessions</a><a href="#section-toc.1-1.5.2.20.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.21">
                <p id="section-toc.1-1.5.2.21.1"><a href="#section-5.21" class="xref">5.21</a>. <a href="#name-rfc-6230-media-control-chan" class="xref">RFC 6230: Media Control Channel Framework</a><a href="#section-toc.1-1.5.2.21.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.22">
                <p id="section-toc.1-1.5.2.22.1"><a href="#section-5.22" class="xref">5.22</a>. <a href="#name-rfc-6364-sdp-elements-for-f" class="xref">RFC 6364: SDP Elements for FEC Framework</a><a href="#section-toc.1-1.5.2.22.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.23">
                <p id="section-toc.1-1.5.2.23.1"><a href="#section-5.23" class="xref">5.23</a>. <a href="#name-rfc-4796-content-attribute" class="xref">RFC 4796: "content" Attribute</a><a href="#section-toc.1-1.5.2.23.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.24">
                <p id="section-toc.1-1.5.2.24.1"><a href="#section-5.24" class="xref">5.24</a>. <a href="#name-rfc-3407-sdp-simple-capabil" class="xref">RFC 3407: SDP Simple Capability Declaration</a><a href="#section-toc.1-1.5.2.24.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.25">
                <p id="section-toc.1-1.5.2.25.1"><a href="#section-5.25" class="xref">5.25</a>. <a href="#name-rfc-6284-port-mapping-betwe" class="xref">RFC 6284: Port Mapping between Unicast and Multicast RTP Sessions</a><a href="#section-toc.1-1.5.2.25.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.26">
                <p id="section-toc.1-1.5.2.26.1"><a href="#section-5.26" class="xref">5.26</a>. <a href="#name-rfc-6714-msrp-cema" class="xref">RFC 6714: MSRP-CEMA</a><a href="#section-toc.1-1.5.2.26.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.27">
                <p id="section-toc.1-1.5.2.27.1"><a href="#section-5.27" class="xref">5.27</a>. <a href="#name-rfc-4583-sdp-format-for-bfc" class="xref">RFC 4583: SDP Format for BFCP Streams</a><a href="#section-toc.1-1.5.2.27.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.28">
                <p id="section-toc.1-1.5.2.28.1"><a href="#section-5.28" class="xref">5.28</a>. <a href="#name-rfc-5547-sdp-offer-answer-f" class="xref">RFC 5547: SDP Offer/Answer for File Transfer</a><a href="#section-toc.1-1.5.2.28.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.29">
                <p id="section-toc.1-1.5.2.29.1"><a href="#section-5.29" class="xref">5.29</a>. <a href="#name-rfc-6849-sdp-and-rtp-media-" class="xref">RFC 6849: SDP and RTP Media Loopback Extension</a><a href="#section-toc.1-1.5.2.29.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.30">
                <p id="section-toc.1-1.5.2.30.1"><a href="#section-5.30" class="xref">5.30</a>. <a href="#name-rfc-5760-rtcp-with-unicast-" class="xref">RFC 5760: RTCP with Unicast Feedback</a><a href="#section-toc.1-1.5.2.30.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.31">
                <p id="section-toc.1-1.5.2.31.1"><a href="#section-5.31" class="xref">5.31</a>. <a href="#name-rfc-3611-rtcp-xr" class="xref">RFC 3611: RTCP XR</a><a href="#section-toc.1-1.5.2.31.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.32">
                <p id="section-toc.1-1.5.2.32.1"><a href="#section-5.32" class="xref">5.32</a>. <a href="#name-rfc-5939-sdp-capability-neg" class="xref">RFC 5939: SDP Capability Negotiation</a><a href="#section-toc.1-1.5.2.32.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.33">
                <p id="section-toc.1-1.5.2.33.1"><a href="#section-5.33" class="xref">5.33</a>. <a href="#name-rfc-6871-sdp-media-capabili" class="xref">RFC 6871: SDP Media Capabilities Negotiation</a><a href="#section-toc.1-1.5.2.33.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.34">
                <p id="section-toc.1-1.5.2.34.1"><a href="#section-5.34" class="xref">5.34</a>. <a href="#name-rfc-7006-miscellaneous-capa" class="xref">RFC 7006: Miscellaneous Capabilities Negotiation in SDP</a><a href="#section-toc.1-1.5.2.34.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.35">
                <p id="section-toc.1-1.5.2.35.1"><a href="#section-5.35" class="xref">5.35</a>. <a href="#name-rfc-4567-key-management-ext" class="xref">RFC 4567: Key Management Extensions for SDP and RTSP</a><a href="#section-toc.1-1.5.2.35.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.36">
                <p id="section-toc.1-1.5.2.36.1"><a href="#section-5.36" class="xref">5.36</a>. <a href="#name-rfc-4572-comedia-over-tls-i" class="xref">RFC 4572: Comedia over TLS in SDP</a><a href="#section-toc.1-1.5.2.36.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.37">
                <p id="section-toc.1-1.5.2.37.1"><a href="#section-5.37" class="xref">5.37</a>. <a href="#name-rfc-4570-sdp-source-filters" class="xref">RFC 4570: SDP Source Filters</a><a href="#section-toc.1-1.5.2.37.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.38">
                <p id="section-toc.1-1.5.2.38.1"><a href="#section-5.38" class="xref">5.38</a>. <a href="#name-rfc-6128-rtcp-port-for-mult" class="xref">RFC 6128: RTCP Port for Multicast Sessions</a><a href="#section-toc.1-1.5.2.38.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.39">
                <p id="section-toc.1-1.5.2.39.1"><a href="#section-5.39" class="xref">5.39</a>. <a href="#name-rfc-6189-zrtp" class="xref">RFC 6189: ZRTP</a><a href="#section-toc.1-1.5.2.39.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.40">
                <p id="section-toc.1-1.5.2.40.1"><a href="#section-5.40" class="xref">5.40</a>. <a href="#name-rfc-4145-connection-oriente" class="xref">RFC 4145: Connection-Oriented Media</a><a href="#section-toc.1-1.5.2.40.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.41">
                <p id="section-toc.1-1.5.2.41.1"><a href="#section-5.41" class="xref">5.41</a>. <a href="#name-rfc-6947-the-sdp-altc-attri" class="xref">RFC 6947: The SDP "altc" Attribute</a><a href="#section-toc.1-1.5.2.41.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.42">
                <p id="section-toc.1-1.5.2.42.1"><a href="#section-5.42" class="xref">5.42</a>. <a href="#name-rfc-7195-sdp-extension-for-" class="xref">RFC 7195: SDP Extension for Circuit-Switched Bearers         in PSTN</a><a href="#section-toc.1-1.5.2.42.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.43">
                <p id="section-toc.1-1.5.2.43.1"><a href="#section-5.43" class="xref">5.43</a>. <a href="#name-rfc-7272-idms-using-the-rtp" class="xref">RFC 7272: IDMS Using the RTP Control Protocol (RTCP)</a><a href="#section-toc.1-1.5.2.43.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.44">
                <p id="section-toc.1-1.5.2.44.1"><a href="#section-5.44" class="xref">5.44</a>. <a href="#name-rfc-5159-open-mobile-allian" class="xref">RFC 5159: Open Mobile Alliance (OMA) Broadcast (BCAST) SDP Attributes</a><a href="#section-toc.1-1.5.2.44.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.45">
                <p id="section-toc.1-1.5.2.45.1"><a href="#section-5.45" class="xref">5.45</a>. <a href="#name-rfc-6193-media-description-" class="xref">RFC 6193: Media Description for IKE in SDP</a><a href="#section-toc.1-1.5.2.45.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.46">
                <p id="section-toc.1-1.5.2.46.1"><a href="#section-5.46" class="xref">5.46</a>. <a href="#name-rfc-2326-real-time-streamin" class="xref">RFC 2326: Real Time Streaming Protocol</a><a href="#section-toc.1-1.5.2.46.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.47">
                <p id="section-toc.1-1.5.2.47.1"><a href="#section-5.47" class="xref">5.47</a>. <a href="#name-rfc-7826-real-time-streamin" class="xref">RFC 7826: Real-Time Streaming Protocol</a><a href="#section-toc.1-1.5.2.47.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.48">
                <p id="section-toc.1-1.5.2.48.1"><a href="#section-5.48" class="xref">5.48</a>. <a href="#name-rfc-6064-sdp-and-rtsp-exten" class="xref">RFC 6064: SDP and RTSP Extensions for 3GPP</a><a href="#section-toc.1-1.5.2.48.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.49">
                <p id="section-toc.1-1.5.2.49.1"><a href="#section-5.49" class="xref">5.49</a>. <a href="#name-rfc-3108-atm-sdp" class="xref">RFC 3108: ATM SDP</a><a href="#section-toc.1-1.5.2.49.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.50">
                <p id="section-toc.1-1.5.2.50.1"><a href="#section-5.50" class="xref">5.50</a>. <a href="#name-3gpp-ts-183063" class="xref">3GPP TS 183.063</a><a href="#section-toc.1-1.5.2.50.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.51">
                <p id="section-toc.1-1.5.2.51.1"><a href="#section-5.51" class="xref">5.51</a>. <a href="#name-3gpp-ts-24229" class="xref">3GPP TS 24.229</a><a href="#section-toc.1-1.5.2.51.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.52">
                <p id="section-toc.1-1.5.2.52.1"><a href="#section-5.52" class="xref">5.52</a>. <a href="#name-itu-t38" class="xref">ITU T.38</a><a href="#section-toc.1-1.5.2.52.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.53">
                <p id="section-toc.1-1.5.2.53.1"><a href="#section-5.53" class="xref">5.53</a>. <a href="#name-itu-t-q1970" class="xref">ITU-T Q.1970</a><a href="#section-toc.1-1.5.2.53.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.54">
                <p id="section-toc.1-1.5.2.54.1"><a href="#section-5.54" class="xref">5.54</a>. <a href="#name-itu-t-h24815" class="xref">ITU-T H.248.15</a><a href="#section-toc.1-1.5.2.54.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.55">
                <p id="section-toc.1-1.5.2.55.1"><a href="#section-5.55" class="xref">5.55</a>. <a href="#name-rfc-4975-the-message-sessio" class="xref">RFC 4975: The Message Session Relay Protocol</a><a href="#section-toc.1-1.5.2.55.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.5.2.56">
                <p id="section-toc.1-1.5.2.56.1"><a href="#section-5.56" class="xref">5.56</a>. <a href="#name-historical-attributes" class="xref">Historical Attributes</a><a href="#section-toc.1-1.5.2.56.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.6">
            <p id="section-toc.1-1.6.1"><a href="#section-6" class="xref">6</a>.  <a href="#name-bwtype-attribute-analysis" class="xref">bwtype Attribute Analysis</a><a href="#section-toc.1-1.6.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.6.2.1">
                <p id="section-toc.1-1.6.2.1.1"><a href="#section-6.1" class="xref">6.1</a>.  <a href="#name-rfc-4566-sdp-2" class="xref">RFC 4566: SDP</a><a href="#section-toc.1-1.6.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.6.2.2">
                <p id="section-toc.1-1.6.2.2.1"><a href="#section-6.2" class="xref">6.2</a>.  <a href="#name-rfc-3556-sdp-bandwidth-modi" class="xref">RFC 3556: SDP Bandwidth Modifiers for RTCP Bandwidth</a><a href="#section-toc.1-1.6.2.2.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.6.2.3">
                <p id="section-toc.1-1.6.2.3.1"><a href="#section-6.3" class="xref">6.3</a>.  <a href="#name-rfc-3890-bandwidth-modifier" class="xref">RFC 3890: Bandwidth Modifier for SDP</a><a href="#section-toc.1-1.6.2.3.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.7">
            <p id="section-toc.1-1.7.1"><a href="#section-7" class="xref">7</a>.  <a href="#name-rtcp-fb-attribute-analysis" class="xref">rtcp-fb Attribute Analysis</a><a href="#section-toc.1-1.7.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.7.2.1">
                <p id="section-toc.1-1.7.2.1.1"><a href="#section-7.1" class="xref">7.1</a>.  <a href="#name-rfc-4585-rtp-avpf-2" class="xref">RFC 4585: RTP/AVPF</a><a href="#section-toc.1-1.7.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.7.2.2">
                <p id="section-toc.1-1.7.2.2.1"><a href="#section-7.2" class="xref">7.2</a>.  <a href="#name-rfc-5104-codec-control-mess" class="xref">RFC 5104: Codec Control Messages in AVPF</a><a href="#section-toc.1-1.7.2.2.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.7.2.3">
                <p id="section-toc.1-1.7.2.3.1"><a href="#section-7.3" class="xref">7.3</a>.  <a href="#name-rfc-6285-unicast-based-rapi" class="xref">RFC 6285: Unicast-Based Rapid Acquisition of Multicast        RTP Sessions (RAMS)</a><a href="#section-toc.1-1.7.2.3.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.7.2.4">
                <p id="section-toc.1-1.7.2.4.1"><a href="#section-7.4" class="xref">7.4</a>.  <a href="#name-rfc-6679-ecn-for-rtp-over-u" class="xref">RFC 6679: ECN for RTP over UDP/IP</a><a href="#section-toc.1-1.7.2.4.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.7.2.5">
                <p id="section-toc.1-1.7.2.5.1"><a href="#section-7.5" class="xref">7.5</a>.  <a href="#name-rfc-6642-third-party-loss-r" class="xref">RFC 6642: Third-Party Loss Report</a><a href="#section-toc.1-1.7.2.5.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.7.2.6">
                <p id="section-toc.1-1.7.2.6.1"><a href="#section-7.6" class="xref">7.6</a>.  <a href="#name-rfc-5104-codec-control-messa" class="xref">RFC 5104: Codec Control Messages in AVPF</a><a href="#section-toc.1-1.7.2.6.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.8">
            <p id="section-toc.1-1.8.1"><a href="#section-8" class="xref">8</a>.  <a href="#name-group-attribute-analysis" class="xref">group Attribute Analysis</a><a href="#section-toc.1-1.8.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.8.2.1">
                <p id="section-toc.1-1.8.2.1.1"><a href="#section-8.1" class="xref">8.1</a>.  <a href="#name-rfc-5888-sdp-grouping-frame" class="xref">RFC 5888: SDP Grouping Framework</a><a href="#section-toc.1-1.8.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.8.2.2">
                <p id="section-toc.1-1.8.2.2.1"><a href="#section-8.2" class="xref">8.2</a>.  <a href="#name-rfc-3524-mapping-media-stre" class="xref">RFC 3524: Mapping Media Streams to Resource Reservation Flows</a><a href="#section-toc.1-1.8.2.2.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.8.2.3">
                <p id="section-toc.1-1.8.2.3.1"><a href="#section-8.3" class="xref">8.3</a>.  <a href="#name-rfc-4091-anat-semantics" class="xref">RFC 4091: ANAT Semantics</a><a href="#section-toc.1-1.8.2.3.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.8.2.4">
                <p id="section-toc.1-1.8.2.4.1"><a href="#section-8.4" class="xref">8.4</a>.  <a href="#name-rfc-5956-fec-grouping-seman" class="xref">RFC 5956: FEC Grouping Semantics in SDP</a><a href="#section-toc.1-1.8.2.4.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.8.2.5">
                <p id="section-toc.1-1.8.2.5.1"><a href="#section-8.5" class="xref">8.5</a>.  <a href="#name-rfc-5583-signaling-media-de" class="xref">RFC 5583: Signaling Media Decoding Dependency in SDP</a><a href="#section-toc.1-1.8.2.5.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.8.2.6">
                <p id="section-toc.1-1.8.2.6.1"><a href="#section-8.6" class="xref">8.6</a>.  <a href="#name-rfc-7104-duplication-groupi" class="xref">RFC 7104: Duplication Grouping Semantics in the SDP</a><a href="#section-toc.1-1.8.2.6.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.9">
            <p id="section-toc.1-1.9.1"><a href="#section-9" class="xref">9</a>.  <a href="#name-ssrc-group-attribute-analys" class="xref">ssrc-group Attribute Analysis</a><a href="#section-toc.1-1.9.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.9.2.1">
                <p id="section-toc.1-1.9.2.1.1"><a href="#section-9.1" class="xref">9.1</a>.  <a href="#name-rfc-5576-source-specific-sdp" class="xref">RFC 5576: Source-Specific SDP Attributes</a><a href="#section-toc.1-1.9.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.9.2.2">
                <p id="section-toc.1-1.9.2.2.1"><a href="#section-9.2" class="xref">9.2</a>.  <a href="#name-rfc-7104-duplication-groupin" class="xref">RFC 7104: Duplication Grouping Semantics in the SDP</a><a href="#section-toc.1-1.9.2.2.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.10">
            <p id="section-toc.1-1.10.1"><a href="#section-10" class="xref">10</a>. <a href="#name-qos-mechanism-token-analysi" class="xref">QoS Mechanism Token Analysis</a><a href="#section-toc.1-1.10.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.10.2.1">
                <p id="section-toc.1-1.10.2.1.1"><a href="#section-10.1" class="xref">10.1</a>.  <a href="#name-rfc-5432-qos-mechanism-selec" class="xref">RFC 5432: QoS Mechanism Selection in SDP</a><a href="#section-toc.1-1.10.2.1.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.11">
            <p id="section-toc.1-1.11.1"><a href="#section-11" class="xref">11</a>. <a href="#name-k-attribute-analysis" class="xref">k= Attribute Analysis</a><a href="#section-toc.1-1.11.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.11.2.1">
                <p id="section-toc.1-1.11.2.1.1"><a href="#section-11.1" class="xref">11.1</a>.  <a href="#name-rfc-4566-sdp-3" class="xref">RFC 4566: SDP</a><a href="#section-toc.1-1.11.2.1.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.12">
            <p id="section-toc.1-1.12.1"><a href="#section-12" class="xref">12</a>. <a href="#name-content-attribute-analysis" class="xref">content Attribute Analysis</a><a href="#section-toc.1-1.12.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.12.2.1">
                <p id="section-toc.1-1.12.2.1.1"><a href="#section-12.1" class="xref">12.1</a>.  <a href="#name-rfc-4796" class="xref">RFC 4796</a><a href="#section-toc.1-1.12.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.12.2.2">
                <p id="section-toc.1-1.12.2.2.1"><a href="#section-12.2" class="xref">12.2</a>.  <a href="#name-3gpp-ts-24182" class="xref">3GPP TS 24.182</a><a href="#section-toc.1-1.12.2.2.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.12.2.3">
                <p id="section-toc.1-1.12.2.3.1"><a href="#section-12.3" class="xref">12.3</a>.  <a href="#name-3gpp-ts-24183" class="xref">3GPP TS 24.183</a><a href="#section-toc.1-1.12.2.3.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.13">
            <p id="section-toc.1-1.13.1"><a href="#section-13" class="xref">13</a>. <a href="#name-payload-formats" class="xref">Payload Formats</a><a href="#section-toc.1-1.13.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.13.2.1">
                <p id="section-toc.1-1.13.2.1.1"><a href="#section-13.1" class="xref">13.1</a>.  <a href="#name-rfc-5109-rtp-payload-format" class="xref">RFC 5109: RTP Payload Format for Generic FEC</a><a href="#section-toc.1-1.13.2.1.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.14">
            <p id="section-toc.1-1.14.1"><a href="#section-14" class="xref">14</a>. <a href="#name-multiplexing-considerations" class="xref">Multiplexing Considerations for Encapsulating Attributes</a><a href="#section-toc.1-1.14.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.14.2.1">
                <p id="section-toc.1-1.14.2.1.1"><a href="#section-14.1" class="xref">14.1</a>.  <a href="#name-rfc-3407-cpar-attribute-ana" class="xref">RFC 3407: cpar Attribute Analysis</a><a href="#section-toc.1-1.14.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.14.2.2">
                <p id="section-toc.1-1.14.2.2.1"><a href="#section-14.2" class="xref">14.2</a>.  <a href="#name-rfc-5939-analysis" class="xref">RFC 5939 Analysis</a><a href="#section-toc.1-1.14.2.2.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.14.2.2.2.1">
                    <p id="section-toc.1-1.14.2.2.2.1.1"><a href="#section-14.2.1" class="xref">14.2.1</a>.  <a href="#name-recommendation-procedures-f" class="xref">Recommendation: Procedures for Potential Configuration Pairing</a><a href="#section-toc.1-1.14.2.2.2.1.1" class="pilcrow">¶</a></p>
</li>
                </ul>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.14.2.3">
                <p id="section-toc.1-1.14.2.3.1"><a href="#section-14.3" class="xref">14.3</a>.  <a href="#name-rfc-6871-analysis" class="xref">RFC 6871 Analysis</a><a href="#section-toc.1-1.14.2.3.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.14.2.3.2.1">
                    <p id="section-toc.1-1.14.2.3.2.1.1"><a href="#section-14.3.1" class="xref">14.3.1</a>.  <a href="#name-recommendation-dealing-with" class="xref">Recommendation: Dealing with Payload Type Numbers</a><a href="#section-toc.1-1.14.2.3.2.1.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.14.2.3.2.2">
                    <p id="section-toc.1-1.14.2.3.2.2.1"><a href="#section-14.3.2" class="xref">14.3.2</a>.  <a href="#name-recommendation-dealing-with-" class="xref">Recommendation: Dealing with Latent Configurations</a><a href="#section-toc.1-1.14.2.3.2.2.1" class="pilcrow">¶</a></p>
</li>
                </ul>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.15">
            <p id="section-toc.1-1.15.1"><a href="#section-15" class="xref">15</a>. <a href="#name-iana-considerations" class="xref">IANA Considerations</a><a href="#section-toc.1-1.15.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.15.2.1">
                <p id="section-toc.1-1.15.2.1.1"><a href="#section-15.1" class="xref">15.1</a>.  <a href="#name-new-multiplexing-categories" class="xref">New "Multiplexing Categories" Subregistry</a><a href="#section-toc.1-1.15.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2">
                <p id="section-toc.1-1.15.2.2.1"><a href="#section-15.2" class="xref">15.2</a>.  <a href="#name-mux-category-column-for-sub" class="xref">"Mux Category" Column for Subregistries</a><a href="#section-toc.1-1.15.2.2.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.1">
                    <p id="section-toc.1-1.15.2.2.2.1.1"><a href="#section-15.2.1" class="xref">15.2.1</a>.  <a href="#name-table-sdp-bwtype" class="xref">Table: SDP bwtype</a><a href="#section-toc.1-1.15.2.2.2.1.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.2">
                    <p id="section-toc.1-1.15.2.2.2.2.1"><a href="#section-15.2.2" class="xref">15.2.2</a>.  <a href="#name-table-attribute-name" class="xref">Table: attribute-name</a><a href="#section-toc.1-1.15.2.2.2.2.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.3">
                    <p id="section-toc.1-1.15.2.2.2.3.1"><a href="#section-15.2.3" class="xref">15.2.3</a>.  <a href="#name-table-content-sdp-parameter" class="xref">Table: content SDP Parameters</a><a href="#section-toc.1-1.15.2.2.2.3.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.4">
                    <p id="section-toc.1-1.15.2.2.2.4.1"><a href="#section-15.2.4" class="xref">15.2.4</a>.  <a href="#name-table-semantics-for-the-gro" class="xref">Table: Semantics for the "group" SDP Attribute</a><a href="#section-toc.1-1.15.2.2.2.4.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.5">
                    <p id="section-toc.1-1.15.2.2.2.5.1"><a href="#section-15.2.5" class="xref">15.2.5</a>.  <a href="#name-table-rtcp-fb-attribute-val" class="xref">Table: "rtcp-fb" Attribute Values</a><a href="#section-toc.1-1.15.2.2.2.5.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.6">
                    <p id="section-toc.1-1.15.2.2.2.6.1"><a href="#section-15.2.6" class="xref">15.2.6</a>.  <a href="#name-table-ack-and-nack-attribut" class="xref">Table: "ack" and "nack" Attribute Values</a><a href="#section-toc.1-1.15.2.2.2.6.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.7">
                    <p id="section-toc.1-1.15.2.2.2.7.1"><a href="#section-15.2.7" class="xref">15.2.7</a>.  <a href="#name-table-depend-sdp-attribute-" class="xref">Table: "depend" SDP Attribute Values</a><a href="#section-toc.1-1.15.2.2.2.7.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.8">
                    <p id="section-toc.1-1.15.2.2.2.8.1"><a href="#section-15.2.8" class="xref">15.2.8</a>.  <a href="#name-table-cs-correlation-attrib" class="xref">Table: "cs-correlation" Attribute Values</a><a href="#section-toc.1-1.15.2.2.2.8.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.9">
                    <p id="section-toc.1-1.15.2.2.2.9.1"><a href="#section-15.2.9" class="xref">15.2.9</a>.  <a href="#name-table-semantics-for-the-ssr" class="xref">Table: Semantics for the "ssrc-group" SDP Attribute</a><a href="#section-toc.1-1.15.2.2.2.9.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.10">
                    <p id="section-toc.1-1.15.2.2.2.10.1"><a href="#section-15.2.10" class="xref">15.2.10</a>. <a href="#name-table-sdp-rtsp-key-manageme" class="xref">Table: SDP/RTSP Key Management Protocol Identifiers</a><a href="#section-toc.1-1.15.2.2.2.10.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.11">
                    <p id="section-toc.1-1.15.2.2.2.11.1"><a href="#section-15.2.11" class="xref">15.2.11</a>. <a href="#name-table-codec-control-message" class="xref">Table: Codec Control Messages</a><a href="#section-toc.1-1.15.2.2.2.11.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.12">
                    <p id="section-toc.1-1.15.2.2.2.12.1"><a href="#section-15.2.12" class="xref">15.2.12</a>. <a href="#name-table-qos-mechanism-tokens" class="xref">Table: QoS Mechanism Tokens</a><a href="#section-toc.1-1.15.2.2.2.12.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.13">
                    <p id="section-toc.1-1.15.2.2.2.13.1"><a href="#section-15.2.13" class="xref">15.2.13</a>. <a href="#name-table-sdp-capability-negoti" class="xref">Table: SDP Capability Negotiation Option Tags</a><a href="#section-toc.1-1.15.2.2.2.13.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.14">
                    <p id="section-toc.1-1.15.2.2.2.14.1"><a href="#section-15.2.14" class="xref">15.2.14</a>. <a href="#name-table-timestamp-reference-c" class="xref">Table: Timestamp Reference Clock Source Parameters</a><a href="#section-toc.1-1.15.2.2.2.14.1" class="pilcrow">¶</a></p>
</li>
                  <li class="compact toc ulEmpty" id="section-toc.1-1.15.2.2.2.15">
                    <p id="section-toc.1-1.15.2.2.2.15.1"><a href="#section-15.2.15" class="xref">15.2.15</a>. <a href="#name-table-media-clock-source-pa" class="xref">Table: Media Clock Source Parameters</a><a href="#section-toc.1-1.15.2.2.2.15.1" class="pilcrow">¶</a></p>
</li>
                </ul>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.16">
            <p id="section-toc.1-1.16.1"><a href="#section-16" class="xref">16</a>. <a href="#name-security-considerations" class="xref">Security Considerations</a><a href="#section-toc.1-1.16.1" class="pilcrow">¶</a></p>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.17">
            <p id="section-toc.1-1.17.1"><a href="#section-17" class="xref">17</a>. <a href="#name-references" class="xref">References</a><a href="#section-toc.1-1.17.1" class="pilcrow">¶</a></p>
<ul class="compact toc ulEmpty">
<li class="compact toc ulEmpty" id="section-toc.1-1.17.2.1">
                <p id="section-toc.1-1.17.2.1.1"><a href="#section-17.1" class="xref">17.1</a>.  <a href="#name-normative-references" class="xref">Normative References</a><a href="#section-toc.1-1.17.2.1.1" class="pilcrow">¶</a></p>
</li>
              <li class="compact toc ulEmpty" id="section-toc.1-1.17.2.2">
                <p id="section-toc.1-1.17.2.2.1"><a href="#section-17.2" class="xref">17.2</a>.  <a href="#name-informative-references" class="xref">Informative References</a><a href="#section-toc.1-1.17.2.2.1" class="pilcrow">¶</a></p>
</li>
            </ul>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.18">
            <p id="section-toc.1-1.18.1"><a href="#section-appendix.a" class="xref"></a><a href="#name-acknowledgements" class="xref">Acknowledgements</a><a href="#section-toc.1-1.18.1" class="pilcrow">¶</a></p>
</li>
          <li class="ulEmpty toc compact" id="section-toc.1-1.19">
            <p id="section-toc.1-1.19.1"><a href="#section-appendix.b" class="xref"></a><a href="#name-authors-address" class="xref">Author's Address</a><a href="#section-toc.1-1.19.1" class="pilcrow">¶</a></p>
</li>
        </ul>
</nav>
</section>
</div>
<div id="sec-intro">
<section id="section-1">
      <h2 id="name-introduction">
<a href="#section-1" class="section-number selfRef">1. </a><a href="#name-introduction" class="section-name selfRef">Introduction</a>
      </h2>
<p id="section-1-1">SDP defines several attributes for capturing characteristics that
        apply to the individual media descriptions (described by "m=" lines)
        and the overall multimedia session. Typically, different media types
        (audio, video, etc.) described using different media descriptions
        represent separate RTP sessions that are carried over individual
        transport-layer flows. However, <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>
        defines a way to use a single address:port combination (BUNDLE address)
        for receiving media associated with multiple SDP media
        descriptions. This would, for example, allow the usage of a
        single set of Interactive Connectivity Establishment (ICE) <span>[<a href="#RFC8445" class="xref">RFC8445</a>]</span>
        candidates for multiple media descriptions. This, in turn, has made
        it necessary to understand the interpretation and usage of the SDP
        attributes defined for the multiplexed media descriptions.<a href="#section-1-1" class="pilcrow">¶</a></p>
<p id="section-1-2">Given the number of SDP attributes registered with the
        <span>[<a href="#IANA" class="xref">IANA</a>]</span> and the possibility of new attributes
        being defined in the future, there is need for a framework to
        analyze these attributes for their applicability in the transport
        multiplexing use cases.<a href="#section-1-2" class="pilcrow">¶</a></p>
<p id="section-1-3">The document starts with providing the motivation for
        requiring such a framework. This is followed by introduction
        to the SDP attribute analysis framework and procedures, following
        which several sections apply the framework to the SDP
        attributes registered with the <span>[<a href="#IANA" class="xref">IANA</a>]</span>.<a href="#section-1-3" class="pilcrow">¶</a></p>
</section>
</div>
<section id="section-2">
      <h2 id="name-terminology">
<a href="#section-2" class="section-number selfRef">2. </a><a href="#name-terminology" class="section-name selfRef">Terminology</a>
      </h2>
<span class="break"></span><dl class="dlParallel" id="section-2-1">
        <dt id="section-2-1.1">5-tuple:</dt>
        <dd style="margin-left: 1.5em" id="section-2-1.2">A collection of the following values: source address,
       source port, destination address, destination port, and
       transport-layer protocol.<a href="#section-2-1.2" class="pilcrow">¶</a>
</dd>
        <dd class="break"></dd>
<dt id="section-2-1.3">3GPP:</dt>
        <dd style="margin-left: 1.5em" id="section-2-1.4">Third Generation Partnership Project; see
        <span>&lt;<a href="https://www.3gpp.org">https://www.3gpp.org</a>&gt;</span> for more information about this
        organization.<a href="#section-2-1.4" class="pilcrow">¶</a>
</dd>
      <dd class="break"></dd>
</dl>
<p id="section-2-2">
    The key words "<span class="bcp14">MUST</span>", "<span class="bcp14">MUST NOT</span>", "<span class="bcp14">REQUIRED</span>", "<span class="bcp14">SHALL</span>", "<span class="bcp14">SHALL NOT</span>", "<span class="bcp14">SHOULD</span>", "<span class="bcp14">SHOULD NOT</span>", "<span class="bcp14">RECOMMENDED</span>", "<span class="bcp14">NOT RECOMMENDED</span>",
    "<span class="bcp14">MAY</span>", and "<span class="bcp14">OPTIONAL</span>" in this document are to be interpreted as
    described in BCP 14 <span>[<a href="#RFC2119" class="xref">RFC2119</a>]</span> <span>[<a href="#RFC8174" class="xref">RFC8174</a>]</span> 
    when, and only when, they appear in all capitals, as shown here.<a href="#section-2-2" class="pilcrow">¶</a></p>
</section>
<section id="section-3">
      <h2 id="name-motivation">
<a href="#section-3" class="section-number selfRef">3. </a><a href="#name-motivation" class="section-name selfRef">Motivation</a>
      </h2>
<p id="section-3-1">
   An effort to reduce the number of necessary transport-level flows is
   required because of the time and complications involved in setting up
   Secure Real-time Transport Protocol (SRTP) <span>[<a href="#RFC5763" class="xref">RFC5763</a>]</span>
   transports for use by RTP based on ICE <span>[<a href="#RFC8445" class="xref">RFC8445</a>]</span> and
   Datagram Transport Layer Security (DTLS).  These procedures motivate
   conservation of ports bindings on the Network Address Translators (NATs).

   This necessity has resulted in the definition of ways,
        such as that described in <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>,
        to multiplex RTP over a single transport flow in order to
        preserve network resources such as port numbers. This imposes
        further restrictions on applicability of the SDP attributes
        as they are defined today.<a href="#section-3-1" class="pilcrow">¶</a></p>
<p id="section-3-2">The specific problem is that there are attribute combinations
        that make sense when specified on independent "m=" lines -- as
        with classical SDP -- that do not make sense when those
        "m=" lines are then multiplexed over the same transport. To give
        an obvious example, ICE permits each "m=" line to have an
        independently specified "ice-ufrag" attribute. However, if the
        media from multiple "m=" lines is multiplexed over the same ICE
        component, then the meaning of media-level "ice-ufrag"
        attributes becomes muddled.<a href="#section-3-2" class="pilcrow">¶</a></p>
<p id="section-3-3">At the time of writing this document, there are close to 250 SDP
       attributes registered with the <span>[<a href="#IANA" class="xref">IANA</a>]</span>, and more
       will be added in the future. There is no clearly defined procedure to
        establish the validity/applicability of these attributes when
        used with transport multiplexing.<a href="#section-3-3" class="pilcrow">¶</a></p>
</section>
<div id="sec-mux-fwork">
<section id="section-4">
      <h2 id="name-sdp-attribute-analysis-fram">
<a href="#section-4" class="section-number selfRef">4. </a><a href="#name-sdp-attribute-analysis-fram" class="section-name selfRef">SDP Attribute Analysis Framework</a>
      </h2>
<p id="section-4-1">Attributes in an SDP session description can be defined at the
       session level, media level, or source level. Informally, there are
       various semantic groupings for these attributes. One such grouping
       could be as follows:<a href="#section-4-1" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-4-2.1">Attributes related to media content such as media type,
         encoding schemes, and payload types.<a href="#section-4-2.1" class="pilcrow">¶</a>
</li>
        <li class="normal" id="section-4-2.2">Attributes specifying media transport characteristics such as
          RTP/RTP Control Protocol (RTCP) port numbers, network addresses,
          and QoS.<a href="#section-4-2.2" class="pilcrow">¶</a>
</li>
        <li class="normal" id="section-4-2.3">Metadata description attributes capturing session timing and
          origin information.<a href="#section-4-2.3" class="pilcrow">¶</a>
</li>
        <li class="normal" id="section-4-2.4">Attributes establishing relationships between media descriptions,
          such as grouping framework <span>[<a href="#RFC5888" class="xref">RFC5888</a>]</span>.<a href="#section-4-2.4" class="pilcrow">¶</a>
</li>
      </ul>
<p id="section-4-3">The proposed framework analyzes the SDP attributes usage
       under multiplexing and assigns each SDP attribute to an appropriate
       multiplexing category. Since the multiplexing categories defined in
       this specification are independent of any informal semantic groupings
       of the SDP attributes, the categorizations assigned are normative.<a href="#section-4-3" class="pilcrow">¶</a></p>
<section id="section-4.1">
        <h3 id="name-category-normal">
<a href="#section-4.1" class="section-number selfRef">4.1. </a><a href="#name-category-normal" class="section-name selfRef">Category: NORMAL</a>
        </h3>
<p id="section-4.1-1">The attributes in the NORMAL category can be independently
        specified when multiplexed, and they retain their original
        semantics.<a href="#section-4.1-1" class="pilcrow">¶</a></p>
<p id="section-4.1-2">In the example given below, the direction and label
         attributes are independently specified for audio and video
         "m=" lines. These attributes are not impacted by multiplexing
         these media streams over a single transport-layer flow.<a href="#section-4.1-2" class="pilcrow">¶</a></p>
<div id="section-4.1-3">
<pre class="sourcecode lang-sdp">
     v=0
     o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
     s=
     c=IN IP4 host.atlanta.example.com
     t=0 0
     m=audio 49172 RTP/AVP 99
     a=sendonly
     a=label:1
     a=rtpmap:99 iLBC/8000
     m=video 49172 RTP/AVP 31
     a=recvonly
     a=label:2
     a=rtpmap:31 H261/90000
</pre><a href="#section-4.1-3" class="pilcrow">¶</a>
</div>
</section>
<section id="section-4.2">
        <h3 id="name-category-caution">
<a href="#section-4.2" class="section-number selfRef">4.2. </a><a href="#name-category-caution" class="section-name selfRef">Category: CAUTION</a>
        </h3>
<p id="section-4.2-1">It is not advisable to multiplex with the attributes in the CAUTION
 category, since their usage under multiplexing
         might lead to incorrect behavior.<a href="#section-4.2-1" class="pilcrow">¶</a></p>
<p id="section-4.2-2">Example: Multiplexing media descriptions over a single
         Datagram Congestion Control Protocol (DCCP) transport
         <span>[<a href="#RFC5762" class="xref">RFC5762</a>]</span> is not recommended,
         since DCCP is a connection-oriented protocol and therefore doesn't
         allow multiple connections on the same 5-tuple.<a href="#section-4.2-2" class="pilcrow">¶</a></p>
<div id="section-4.2-3">
<pre class="sourcecode lang-sdp">
     v=0
     o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
     s=
     c=IN IP4 client.biloxi.example.com
     t=0 0
     m=video 5004 DCCP/RTP/AVP 99
     a=rtpmap:99 h261/9000
     a=dccp-service-code:SC=x52545056
     a=setup:passive
     a=connection:new
     m=video 5004 DCCP/RTP/AVP 100
     a=rtpmap:100 h261/9000
     a=dccp-service-code:SC=x5254504f
     a=setup:passive
     a=connection:new
</pre><a href="#section-4.2-3" class="pilcrow">¶</a>
</div>
</section>
<section id="section-4.3">
        <h3 id="name-category-identical">
<a href="#section-4.3" class="section-number selfRef">4.3. </a><a href="#name-category-identical" class="section-name selfRef">Category: IDENTICAL</a>
        </h3>
<p id="section-4.3-1">The attributes and their associated values (if any) in the
         IDENTICAL category <span class="bcp14">MUST</span> be repeated across all the
         media descriptions under multiplexing.<a href="#section-4.3-1" class="pilcrow">¶</a></p>
<p id="section-4.3-2">Attributes such as rtcp-mux fall into this category. Since
          RTCP reporting is done per RTP session, RTCP multiplexing
          <span class="bcp14">MUST</span> be enabled for both the audio and video "m=" lines if
          they are transported over a single 5-tuple.<a href="#section-4.3-2" class="pilcrow">¶</a></p>
<div id="section-4.3-3">
<pre class="sourcecode lang-sdp">
     v=0
     o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com
     s=
     c=IN IP4 client.biloxi.example.com
     t=0 0
     m=audio 34567 RTP/AVP 97
     a=rtcp-mux
     m=video 34567 RTP/AVP 31
     a=rtpmap:31 H261/90000
     a=rtcp-mux
</pre><a href="#section-4.3-3" class="pilcrow">¶</a>
</div>
<p id="section-4.3-4">Note: Even though IDENTICAL attributes must be repeated across all media 
       descriptions under multiplexing, they might not always be explicitly encoded across 
       all media descriptions. <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span> 
       defines rules for when attributes and their values are implicitly applied to media 
       description.<a href="#section-4.3-4" class="pilcrow">¶</a></p>
</section>
<section id="section-4.4">
        <h3 id="name-category-sum">
<a href="#section-4.4" class="section-number selfRef">4.4. </a><a href="#name-category-sum" class="section-name selfRef">Category: SUM</a>
        </h3>
<p id="section-4.4-1">The attributes in the SUM category can be set as they are
         normally used, but software using them in the multiplexing scenario
         <span class="bcp14">MUST</span> apply the sum of all the attributes being multiplexed instead of
         trying to use them independently. This is typically used for
         bandwidth or other rate-limiting attributes to the
         underlying transport.<a href="#section-4.4-1" class="pilcrow">¶</a></p>
<p id="section-4.4-2">
          The software parsing the SDP sample below should use the
          aggregate Application Specific (AS) bandwidth value from the
          individual media descriptions to determine the AS value for
          the multiplexed session. Thus the calculated AS value would
          be 256+64 kilobits per second for the given example.<a href="#section-4.4-2" class="pilcrow">¶</a></p>
<div id="section-4.4-3">
<pre class="sourcecode lang-sdp">
      v=0
      o=test 2890844526 2890842807 IN IP4 client.biloxi.example.com
      c=IN IP4 client.biloxi.example.com
      t=0 0
      m=audio 49170 RTP/AVP 0
      b=AS:64
      m=video 51372 RTP/AVP 31
      b=AS:256
</pre><a href="#section-4.4-3" class="pilcrow">¶</a>
</div>
</section>
<section id="section-4.5">
        <h3 id="name-category-transport">
<a href="#section-4.5" class="section-number selfRef">4.5. </a><a href="#name-category-transport" class="section-name selfRef">Category: TRANSPORT</a>
        </h3>
<p id="section-4.5-1">The attributes in the TRANSPORT category can be set normally
         for multiple items in a multiplexed group, but the software <span class="bcp14">MUST</span>
         pick the one that's associated with the "m=" line whose information is
         used for setting up the underlying transport.<a href="#section-4.5-1" class="pilcrow">¶</a></p>
<p id="section-4.5-2">In the example below, the "a=crypto" attribute is defined for both
         the audio and video "m=" lines. The video media line's "a=crypto"
         attribute is chosen since its MID value (bar) appears first in
         the "a=group:BUNDLE" line. This is due to the BUNDLE grouping semantic
         <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>, which mandates that the values from
  the "m=" line corresponding to the mid
         appearing first on the "a=group:BUNDLE" line be considered for
         setting up the RTP transport.<a href="#section-4.5-2" class="pilcrow">¶</a></p>
<div id="section-4.5-3">
<pre class="sourcecode lang-sdp">
     v=0
     o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
     s=
     c=IN IP4 host.atlanta.example.com
     t=0 0
     a=group:BUNDLE bar foo
     m=audio 49172 RTP/AVP 99
     a=mid:foo
     a=crypto:1 AES_CM_128_HMAC_SHA1_80
       inline:d0RmdmcmVCspeEc3QGZiNWpVLFJhQX1cfHAwJSoj|2^20|1:32
     a=rtpmap:99 iLBC/8000
     m=video 51374 RTP/AVP 31
     a=mid:bar
     a=crypto:1 AES_CM_128_HMAC_SHA1_80
       inline:EcGZiNWpFJhQXdspcl1ekcmVCNWpVLcfHAwJSoj|2^20|1:32
     a=rtpmap:96 H261/90000
</pre><a href="#section-4.5-3" class="pilcrow">¶</a>
</div>
</section>
<section id="section-4.6">
        <h3 id="name-category-inherit">
<a href="#section-4.6" class="section-number selfRef">4.6. </a><a href="#name-category-inherit" class="section-name selfRef">Category: INHERIT</a>
        </h3>
<p id="section-4.6-1">The attributes in the INHERIT category encapsulate other SDP
        attributes or parameters. These attributes inherit their multiplexing
        characteristics from the attributes or parameters they encapsulate.
        Such attributes are defined in <span>[<a href="#RFC3407" class="xref">RFC3407</a>]</span>,
        <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span>, and <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> as part of a
        generic framework for indicating and negotiating capabilities in the
 SDP related to transport, media, and media format.<a href="#section-4.6-1" class="pilcrow">¶</a></p>
<p id="section-4.6-2">The inheritance manifests itself when the encapsulated attribute or
       parameter is being leveraged. In the case of SDP Capability Negotiation
       <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span>, for example, this occurs when a capability
       (encapsulating attribute) is used as part of a configuration; the
       configuration inherits the multiplexing category of each of its
       constituent (encapsulated) attributes and parameters. The inherited
       attributes <span class="bcp14">MUST</span> be coherent in order to form a valid configuration from a
       multiplexing point of view (see <a href="#sec-encap" class="xref">Section 14</a> for
       further details).<a href="#section-4.6-2" class="pilcrow">¶</a></p>
<div id="section-4.6-3">
<pre class="sourcecode lang-sdp">
       v=0
       o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
       s=
       c=IN IP4 host.atlanta.example.com
       t=0 0
       m=video 3456 RTP/AVP 100
       a=rtpmap:100 VP8/90000
       a=fmtp:100 max-fr=30;max-fs=8040
       a=sqn: 0
       a=cdsc: 1 video RTP/AVP 100
       a=cpar: a=rtcp-mux
       m=video 3456 RTP/AVP 101
       a=rtpmap:101 VP8/90000
       a=fmtp:100 max-fr=15;max-fs=1200
       a=cdsc: 2 video RTP/AVP 101
       a=cpar: a=rtcp-mux</pre><a href="#section-4.6-3" class="pilcrow">¶</a>
</div>
<p id="section-4.6-4">In this example, the category IDENTICAL is inherited by
       the cpar-encapsulated "rtcp-mux" attribute.<a href="#section-4.6-4" class="pilcrow">¶</a></p>
</section>
<section id="section-4.7">
        <h3 id="name-category-identical-per-pt">
<a href="#section-4.7" class="section-number selfRef">4.7. </a><a href="#name-category-identical-per-pt" class="section-name selfRef">Category: IDENTICAL-PER-PT</a>
        </h3>
<p id="section-4.7-1">The attributes in the IDENTICAL-PER-PT category define
         the RTP payload configuration on the basis of the payload type, and they
         <span class="bcp14">MUST</span> have identical values across all the media descriptions
         for a given RTP payload type when repeated. 

  These payload types
         identify the same codec configuration as defined in <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-9.1" class="relref">Section 9.1</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span>
         under this context.<a href="#section-4.7-1" class="pilcrow">¶</a></p>
<p id="section-4.7-2">In the SDP example below, Payload Types 96 and 97 are repeated
         across all the video "m=" lines, and all the payload-specific
         parameters (for example, rtpmap and fmtp) are identical.
         (Note: some line breaks are due to formatting only.)<a href="#section-4.7-2" class="pilcrow">¶</a></p>
<div id="section-4.7-3">
<pre class="sourcecode lang-sdp">
     v=0
     o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
     s=
     c=IN IP4 host.atlanta.example.com
     t=0 0
     a=group:BUNDLE cam1 cam2
     m=video 96 97
     a=mid:cam1
     a=rtpmap:96 H264/90000
     a=fmtp:96 profile-level-id=42400d; max-fs=3600; max-fps=3000;
     max-mbps=108000; max-br=1000
     a=rtpmap:97 H264/90000
     a=fmtp:97 profile-level-id=42400a; max-fs=240; max-fps=3000;
     max-mbps=7200; max-br=200
     m=video  96 97
     a=mid:cam2
     a=rtpmap:96 H264/90000
     a=fmtp:96 profile-level-id=42400d; max-fs=3600; max-fps=3000;
     max-mbps=108000; max-br=1000
     a=rtpmap:97 H264/90000
     a=fmtp:97 profile-level-id=42400a; max-fs=240; max-fps=3000;
     max-mbps=7200; max-br=200</pre><a href="#section-4.7-3" class="pilcrow">¶</a>
</div>
</section>
<section id="section-4.8">
        <h3 id="name-category-special">
<a href="#section-4.8" class="section-number selfRef">4.8. </a><a href="#name-category-special" class="section-name selfRef">Category: SPECIAL</a>
        </h3>
<p id="section-4.8-1">For the attributes in the SPECIAL category, the text in the
      specification defining the attribute <span class="bcp14">MUST</span> be consulted for further
      handling when multiplexed.<a href="#section-4.8-1" class="pilcrow">¶</a></p>
<p id="section-4.8-2">As an example, for the attribute "extmap" <span>[<a href="#RFC5285" class="xref">RFC5285</a>]</span>,
      the specification defining the extension needs to be consulted to
      understand the multiplexing implications.<a href="#section-4.8-2" class="pilcrow">¶</a></p>
</section>
<section id="section-4.9">
        <h3 id="name-category-tbd">
<a href="#section-4.9" class="section-number selfRef">4.9. </a><a href="#name-category-tbd" class="section-name selfRef">Category: TBD</a>
        </h3>
<p id="section-4.9-1">The attributes in the TBD category have not been analyzed under the
       proposed multiplexing framework and <span class="bcp14">SHOULD NOT</span> be multiplexed.<a href="#section-4.9-1" class="pilcrow">¶</a></p>
</section>
</section>
</div>
<div id="sec-cur-analysis">
<section id="section-5">
      <h2 id="name-analysis-of-existing-attrib">
<a href="#section-5" class="section-number selfRef">5. </a><a href="#name-analysis-of-existing-attrib" class="section-name selfRef">Analysis of Existing Attributes</a>
      </h2>
<p id="section-5-1">This section analyzes attributes listed in <span>[<a href="#IANA" class="xref">IANA</a>]</span>, grouped under the IETF document that
      defines them.<a href="#section-5-1" class="pilcrow">¶</a></p>
<p id="section-5-2">The "Level" column indicates whether the attribute
      is currently specified as:<a href="#section-5-2" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-5-3.1">S -- Session level<a href="#section-5-3.1" class="pilcrow">¶</a>
</li>
        <li class="normal" id="section-5-3.2">M -- Media level<a href="#section-5-3.2" class="pilcrow">¶</a>
</li>
        <li class="normal" id="section-5-3.3">B -- Both (Implies either a session level or a media level attribute)<a href="#section-5-3.3" class="pilcrow">¶</a>
</li>
        <li class="normal" id="section-5-3.4">SR -- Source-level (for a single SSRC) <span>[<a href="#RFC5576" class="xref">RFC5576</a>]</span><a href="#section-5-3.4" class="pilcrow">¶</a>
</li>
      </ul>
<p id="section-5-4">The "Mux Category" column identifies the multiplexing category
      assigned to each attribute, and the "Notes" column captures additional
      informative details regarding the assigned category, wherever
      necessary.<a href="#section-5-4" class="pilcrow">¶</a></p>
<section id="section-5.1">
        <h3 id="name-rfc-4566-sdp">
<a href="#section-5.1" class="section-number selfRef">5.1. </a><a href="#name-rfc-4566-sdp" class="section-name selfRef">RFC 4566: SDP</a>
        </h3>
<p id="section-5.1-1"><span>[<a href="#RFC4566" class="xref">RFC4566</a>]</span> defines SDP that is intended for describing
      multimedia sessions for the purposes of session announcement,
      session invitation, and other forms of multimedia session
      initiation.<a href="#section-5.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4566-attribute-analysis"></span><table class="center" id="table-1">
          <caption>
<a href="#table-1" class="selfRef">Table 1</a>:
<a href="#name-rfc-4566-attribute-analysis" class="selfRef">RFC 4566 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">sendrecv</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">sendonly</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">recvonly</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">inactive</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cat</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ptime</td>
              <td class="text-left" rowspan="1" colspan="1"> The attribute value <span class="bcp14">MUST</span> be the same
        for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">maxptime</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
        for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">orient</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">framerate</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
        for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">quality</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtpmap</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
        for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fmtp</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
        for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">keywds</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">type</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">type:broadcast</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">type:H332</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">type:meeting</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">type:moderated</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">type:test</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">tool</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">charset</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">sdplang</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">lang</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted
        </td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.2">
        <h3 id="name-rfc-4585-rtp-avpf">
<a href="#section-5.2" class="section-number selfRef">5.2. </a><a href="#name-rfc-4585-rtp-avpf" class="section-name selfRef">RFC 4585: RTP/AVPF</a>
        </h3>
<p id="section-5.2-1"><span>[<a href="#RFC4585" class="xref">RFC4585</a>]</span> defines an extension to
      the Audio-visual Profile (AVP) that enables receivers to
      provide, statistically, more immediate feedback to the senders
      and thus allows for short-term adaptation and efficient
      feedback-based repair mechanisms to be implemented.<a href="#section-5.2-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4585-attribute-analysis"></span><table class="center" id="table-2">
          <caption>
<a href="#table-2" class="selfRef">Table 2</a>:
<a href="#name-rfc-4585-attribute-analysis" class="selfRef">RFC 4585 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp-fb</td>
              <td class="text-left" rowspan="1" colspan="1">Since RTCP feedback attributes are scoped by payload type
        (PT), their values <span class="bcp14">MUST</span> be identical for a given PT across
        the multiplexed "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.3">
        <h3 id="name-rfc-5761-multiplexing-rtp-a">
<a href="#section-5.3" class="section-number selfRef">5.3. </a><a href="#name-rfc-5761-multiplexing-rtp-a" class="section-name selfRef">RFC 5761: Multiplexing RTP and RTCP</a>
        </h3>
<p id="section-5.3-1"><span>[<a href="#RFC5761" class="xref">RFC5761</a>]</span> discusses issues that
        arise when multiplexing RTP data packets and RTP Control
        Protocol (RTCP) packets on a single UDP port. It describes
        when such multiplexing is and is not appropriate, and it
        explains how the SDP can be used to signal multiplexed sessions.<a href="#section-5.3-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5761-attribute-analysis"></span><table class="center" id="table-3">
          <caption>
<a href="#table-3" class="selfRef">Table 3</a>:
<a href="#name-rfc-5761-attribute-analysis" class="selfRef">RFC 5761 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp-mux</td>
              <td class="text-left" rowspan="1" colspan="1">RTP and RTCP multiplexing affects the
          entire RTP session.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.4">
        <h3 id="name-rfc-3312-integration-of-res">
<a href="#section-5.4" class="section-number selfRef">5.4. </a><a href="#name-rfc-3312-integration-of-res" class="section-name selfRef">RFC 3312: Integration of Resource Management and SIP</a>
        </h3>
<p id="section-5.4-1"><span>[<a href="#RFC3312" class="xref">RFC3312</a>]</span>  defines a generic framework for
        preconditions, which are extensible through IANA registration.
        This document also discusses how network quality of service can be
        made a precondition for establishment of sessions initiated by the
        Session Initiation Protocol (SIP). These preconditions require that
        the participant reserve network resources before continuing with the
        session.<a href="#section-5.4-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3312-attribute-analysis"></span><table class="center" id="table-4">
          <caption>
<a href="#table-4" class="selfRef">Table 4</a>:
<a href="#name-rfc-3312-attribute-analysis" class="selfRef">RFC 3312 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">des</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">conf</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">curr</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.4-3">NOTE: A mismatched set of preconditions across media descriptions
         results in session establishment failures due to inability
         to meet the requested resource reservations.<a href="#section-5.4-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.5">
        <h3 id="name-rfc-4574-sdp-label-attribut">
<a href="#section-5.5" class="section-number selfRef">5.5. </a><a href="#name-rfc-4574-sdp-label-attribut" class="section-name selfRef">RFC 4574: SDP "label" Attribute</a>
        </h3>
<p id="section-5.5-1"><span>[<a href="#RFC4574" class="xref">RFC4574</a>]</span> defines a new SDP media-level
        attribute: "label". The "label" attribute carries a pointer to
        a media stream in the context of an arbitrary network application
        that uses SDP. The sender of the SDP document can attach the "label"
        attribute to a particular media stream or streams. The
        application can then use the provided pointer to refer to
        each particular media stream in its context.<a href="#section-5.5-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4574-attribute-analysis"></span><table class="center" id="table-5">
          <caption>
<a href="#table-5" class="selfRef">Table 5</a>:
<a href="#name-rfc-4574-attribute-analysis" class="selfRef">RFC 4574 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">label</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.6">
        <h3 id="name-rfc-5432-qos-mechanism-sele">
<a href="#section-5.6" class="section-number selfRef">5.6. </a><a href="#name-rfc-5432-qos-mechanism-sele" class="section-name selfRef">RFC 5432: QoS Mechanism Selection in SDP</a>
        </h3>
<p id="section-5.6-1"><span>[<a href="#RFC5432" class="xref">RFC5432</a>]</span> defines procedures for
        negotiating QoS mechanisms using the SDP offer/answer model.<a href="#section-5.6-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5432-attribute-analysis"></span><table class="center" id="table-6">
          <caption>
<a href="#table-6" class="selfRef">Table 6</a>:
<a href="#name-rfc-5432-attribute-analysis" class="selfRef">RFC 5432 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">qos-mech-send</td>
              <td class="text-left" rowspan="1" colspan="1"> Refer to <a href="#SecqostokenAnalysis" class="xref">Section 10</a>.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">qos-mech-recv</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#SecqostokenAnalysis" class="xref">Section 10</a>.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.7">
        <h3 id="name-rfc-4568-sdp-security-descr">
<a href="#section-5.7" class="section-number selfRef">5.7. </a><a href="#name-rfc-4568-sdp-security-descr" class="section-name selfRef">RFC 4568: SDP Security Descriptions</a>
        </h3>
<p id="section-5.7-1"><span>[<a href="#RFC4568" class="xref">RFC4568</a>]</span> defines an SDP cryptographic
        attribute for unicast media streams. The attribute describes a
        cryptographic key and other parameters that serve to
        configure security for a unicast media stream in either a
        single message or a roundtrip exchange.<a href="#section-5.7-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4568-attribute-analysis"></span><table class="center" id="table-7">
          <caption>
<a href="#table-7" class="selfRef">Table 7</a>:
<a href="#name-rfc-4568-attribute-analysis" class="selfRef">RFC 4568 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">crypto</td>
              <td class="text-left" rowspan="1" colspan="1">crypto attribute <span class="bcp14">MUST</span> be the one that corresponds
          to the "m=" line chosen for setting up the underlying transport
   flow. </td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.8">
        <h3 id="name-rfc-5762-rtp-over-dccp">
<a href="#section-5.8" class="section-number selfRef">5.8. </a><a href="#name-rfc-5762-rtp-over-dccp" class="section-name selfRef">RFC 5762: RTP over DCCP</a>
        </h3>
<p id="section-5.8-1">RTP is a widely used transport for real-time multimedia
        on IP networks. DCCP is a transport protocol that provides desirable
        services for real-time applications. <span>[<a href="#RFC5762" class="xref">RFC5762</a>]</span>
        specifies a mapping of RTP onto DCCP, along with associated
        signaling, such that real-time applications can make use of
        the services provided by DCCP.<a href="#section-5.8-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5762-attribute-analysis"></span><table class="center" id="table-8">
          <caption>
<a href="#table-8" class="selfRef">Table 8</a>:
<a href="#name-rfc-5762-attribute-analysis" class="selfRef">RFC 5762 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Current</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">dccp-service-code</td>
              <td class="text-left" rowspan="1" colspan="1"> If RFC 6773 is not being
          used in addition to RFC5762, the port in the "m=" line is a
          DCCP port. Being a connection-oriented protocol, DCCP does
          not allow multiple connections on the same
          5-tuple.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.8-3">
         NOTE: If RFC 6773 is being used in addition to RFC 5762, and the
         DCCP-in-UDP layer has additional demultiplexing, then it
         may be possible to use different DCCP service codes for each
         DCCP flow, given each uses a different DCCP port. However,
         doing so might conflict with the media type of the "m="
         line. None of this is standardized yet, and it wouldn't work
         as explained. Hence performing multiplexing is not recommended
         even in this alternate scenario.<a href="#section-5.8-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.9">
        <h3 id="name-rfc-6773-dccp-udp-encapsula">
<a href="#section-5.9" class="section-number selfRef">5.9. </a><a href="#name-rfc-6773-dccp-udp-encapsula" class="section-name selfRef">RFC 6773: DCCP-UDP Encapsulation</a>
        </h3>
<p id="section-5.9-1"><span>[<a href="#RFC6773" class="xref">RFC6773</a>]</span> specifies an
        alternative encapsulation of DCCP, referred to as DCCP-UDP. This
        encapsulation allows DCCP to be carried through the current
        generation of Network Address Translation (NAT) middleboxes
        without modification of those middleboxes.<a href="#section-5.9-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6773-attribute-analysis"></span><table class="center" id="table-9">
          <caption>
<a href="#table-9" class="selfRef">Table 9</a>:
<a href="#name-rfc-6773-attribute-analysis" class="selfRef">RFC 6773 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">dccp-port</td>
              <td class="text-left" rowspan="1" colspan="1"> Multiplexing is not recommended
          due to potential conflict between the port used for DCCP
          encapsulation/decapsulation and the RTP.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.9-3">
   NOTE: RFC 6773 allows DCCP-UDP encapsulation, with the UDP port
   being the port of the DCCP encapsulation/decapsulation service.
   This encapsulation allows arbitrary DCCP packets to be encapsulated,
   and the DCCP port chosen can conflict with
         the port chosen for the RTP traffic. 

  Multiplexing several DCCP-in-UDP encapsulations on the same UDP port
  with no RTP traffic on the same port implies collapsing several DCCP
  port spaces together. Whether or not this works depends on the nature
  of DCCP encapsulation and ports choices; it is thus very application
  dependent.<a href="#section-5.9-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.10">
        <h3 id="name-rfc-5506-reduced-size-rtcp-">
<a href="#section-5.10" class="section-number selfRef">5.10. </a><a href="#name-rfc-5506-reduced-size-rtcp-" class="section-name selfRef">RFC 5506: Reduced-Size RTCP in RTP Profile</a>
        </h3>
<p id="section-5.10-1"><span>[<a href="#RFC5506" class="xref">RFC5506</a>]</span> discusses benefits and
        issues that arise when allowing RTCP packets to be transmitted with
        reduced size.<a href="#section-5.10-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5506-attribute-analysis"></span><table class="center" id="table-10">
          <caption>
<a href="#table-10" class="selfRef">Table 10</a>:
<a href="#name-rfc-5506-attribute-analysis" class="selfRef">RFC 5506 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp-rsize</td>
              <td class="text-left" rowspan="1" colspan="1">Reduced-size RTCP affects the
          entire RTP session.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.11">
        <h3 id="name-rfc-6787-media-resource-con">
<a href="#section-5.11" class="section-number selfRef">5.11. </a><a href="#name-rfc-6787-media-resource-con" class="section-name selfRef">RFC 6787: Media Resource Control Protocol Version 2</a>
        </h3>
<p id="section-5.11-1">The Media Resource Control Protocol Version 2 (MRCPv2)
        allows client hosts to control media service resources such
        as speech synthesizers, recognizers, verifiers, and
        identifiers residing in servers on the network. MRCPv2 is
        not a "stand-alone" protocol; it relies on other
        protocols, such as the SIP, to coordinate MRCPv2 clients and
        servers and manage session between them, and SDP to
        describe, discover, and exchange capabilities. It also
        depends on SIP and SDP to establish the media sessions and
        associated parameters between the media source or sink and
        the media server. Once this is done, the MRCPv2 exchange
        operates over the control session established above,
        allowing the client to control the media-processing
        resources on the speech resource server. <span>[<a href="#RFC6787" class="xref">RFC6787</a>]</span> defines attributes for this
        purpose.<a href="#section-5.11-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6787-attribute-analysis"></span><table class="center" id="table-11">
          <caption>
<a href="#table-11" class="selfRef">Table 11</a>:
<a href="#name-rfc-6787-attribute-analysis" class="selfRef">RFC 6787 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">resource</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">channel</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cmid</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.12">
        <h3 id="name-rfc-8445-ice">
<a href="#section-5.12" class="section-number selfRef">5.12. </a><a href="#name-rfc-8445-ice" class="section-name selfRef">RFC 8445: ICE</a>
        </h3>
<p id="section-5.12-1"><span>[<a href="#RFC8445" class="xref">RFC8445</a>]</span> describes a protocol
        for NAT traversal for UDP-based multimedia sessions
        established with the offer/answer model.
        ICE makes use of the Session Traversal Utilities for NAT
        (STUN) protocol and its extension, Traversal Using Relay NAT (TURN).
        ICE can be used by any protocol utilizing the offer/answer model, such as
        the SIP.<a href="#section-5.12-1" class="pilcrow">¶</a></p>
<span id="name-rfc-8445-attribute-analysis"></span><table class="center" id="table-12">
          <caption>
<a href="#table-12" class="selfRef">Table 12</a>:
<a href="#name-rfc-8445-attribute-analysis" class="selfRef">RFC 8445 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ice-lite</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ice-options</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ice-mismatch</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ice-pwd</td>
              <td class="text-left" rowspan="1" colspan="1">ice-pwd <span class="bcp14">MUST</span> be the one that
          corresponds to the "m=" line chosen for setting up the
          underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ice-ufrag</td>
              <td class="text-left" rowspan="1" colspan="1">ice-ufrag <span class="bcp14">MUST</span> be the one that
          corresponds to the "m=" line chosen for setting up the
          underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">candidate</td>
              <td class="text-left" rowspan="1" colspan="1">ice candidate <span class="bcp14">MUST</span> be the one that
          corresponds to the "m=" line chosen for setting up the
          underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">remote-candidates</td>
              <td class="text-left" rowspan="1" colspan="1">ice remote candidate <span class="bcp14">MUST</span>
          be the one that corresponds to the "m=" line chosen for setting
          up the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ice2</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.13">
        <h3 id="name-rfc-5285-rtp-header-extensi">
<a href="#section-5.13" class="section-number selfRef">5.13. </a><a href="#name-rfc-5285-rtp-header-extensi" class="section-name selfRef">RFC 5285: RTP Header Extensions</a>
        </h3>
<p id="section-5.13-1"><span>[<a href="#RFC5285" class="xref">RFC5285</a>]</span> provides a general
        mechanism for using the header-extension feature of RTP. (Note: <span>[<a href="#RFC5285" class="xref">RFC5285</a>]</span> has been obsoleted by <span>[<a href="#RFC8285" class="xref">RFC8285</a>]</span>.)
        It provides the option to use a small number of small extensions
        in each RTP packet, where the universe of possible extensions is
        large and registration is decentralized. The actual extensions in
        use in a session are signaled in the setup information for
        that session.<a href="#section-5.13-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5285-attribute-analysis"></span><table class="center" id="table-13">
          <caption>
<a href="#table-13" class="selfRef">Table 13</a>:
<a href="#name-rfc-5285-attribute-analysis" class="selfRef">RFC 5285 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">extmap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to the document defining the
          specific RTP extension.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.14">
        <h3 id="name-rfc-3605-rtcp-attribute-in-">
<a href="#section-5.14" class="section-number selfRef">5.14. </a><a href="#name-rfc-3605-rtcp-attribute-in-" class="section-name selfRef">RFC 3605: RTCP Attribute in SDP</a>
        </h3>
<p id="section-5.14-1">Originally, SDP assumed that RTP and RTCP were carried on
     consecutive ports. However, this is not always true when
     NATs are involved. <span>[<a href="#RFC3605" class="xref">RFC3605</a>]</span> specifies an
     early mechanism for indicating the RTCP port.<a href="#section-5.14-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3605-attribute-analysis"></span><table class="center" id="table-14">
          <caption>
<a href="#table-14" class="selfRef">Table 14</a>:
<a href="#name-rfc-3605-attribute-analysis" class="selfRef">RFC 3605 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp</td>
              <td class="text-left" rowspan="1" colspan="1">RTCP port <span class="bcp14">MUST</span> be the one
          that corresponds to the "m=" line chosen for
          setting up the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.15">
        <h3 id="name-rfc-5576-source-specific-sd">
<a href="#section-5.15" class="section-number selfRef">5.15. </a><a href="#name-rfc-5576-source-specific-sd" class="section-name selfRef">RFC 5576: Source-Specific SDP Attributes</a>
        </h3>
<p id="section-5.15-1"><span>[<a href="#RFC5576" class="xref">RFC5576</a>]</span> defines a mechanism for describing RTP
 media sources -- which are identified by their
        synchronization source (SSRC) identifiers -- in SDP, to
        associate attributes with these sources and express
        relationships among sources. It also defines several
        source-level attributes that can be used to describe
        properties of media sources.<a href="#section-5.15-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5576-attribute-analysis"></span><table class="center" id="table-15">
          <caption>
<a href="#table-15" class="selfRef">Table 15</a>:
<a href="#name-rfc-5576-attribute-analysis" class="selfRef">RFC 5576 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ssrc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes
          below.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ssrc-group</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-ssrc-group" class="xref">Section 9</a>
          for specific analysis of the grouping semantics.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cname</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">previous-ssrc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fmtp</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same for a
          given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.15-3">NOTE: If SSRCs are repeated across "m=" lines being multiplexed, they
         <span class="bcp14">MUST</span> all represent the same underlying RTP Source.<a href="#section-5.15-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.16">
        <h3 id="name-rfc-7273-rtp-clock-source-s">
<a href="#section-5.16" class="section-number selfRef">5.16. </a><a href="#name-rfc-7273-rtp-clock-source-s" class="section-name selfRef">RFC 7273: RTP Clock Source Signaling</a>
        </h3>
<p id="section-5.16-1"><span>[<a href="#RFC7273" class="xref">RFC7273</a>]</span> specifies
        SDP signaling that identifies  timestamp reference clock sources
        and SDP signaling that identifies the media clock sources in a
        multimedia session.<a href="#section-5.16-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7273-attribute-analysis"></span><table class="center" id="table-16">
          <caption>
<a href="#table-16" class="selfRef">Table 16</a>:
<a href="#name-rfc-7273-attribute-analysis" class="selfRef">RFC 7273 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mediaclk</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:ntp</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:ptp</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:gps</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:gal</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:glonass</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:local</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ts-refclk:private</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mediaclk:sender</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mediaclk:direct</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mediaclk:IEEE1722</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.17">
        <h3 id="name-rfc-6236-image-attributes-i">
<a href="#section-5.17" class="section-number selfRef">5.17. </a><a href="#name-rfc-6236-image-attributes-i" class="section-name selfRef">RFC 6236: Image Attributes in SDP</a>
        </h3>
<p id="section-5.17-1"><span>[<a href="#RFC6236" class="xref">RFC6236</a>]</span> proposes a new generic
        session setup attribute to make it possible to negotiate
        different image attributes, such as image size. A possible
        use case is to make it possible for a low-end handheld
        terminal to display video without the need to rescale the
        image, something that may consume large amounts of memory and
        processing power. The document also helps to maintain an
        optimal bitrate for video as only the image size that is
        desired by the receiver is transmitted.<a href="#section-5.17-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6236-attribute-analysis"></span><table class="center" id="table-17">
          <caption>
<a href="#table-17" class="selfRef">Table 17</a>:
<a href="#name-rfc-6236-attribute-analysis" class="selfRef">RFC 6236 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">imageattr</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
          for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.18">
        <h3 id="name-rfc-7197-duplication-delay-">
<a href="#section-5.18" class="section-number selfRef">5.18. </a><a href="#name-rfc-7197-duplication-delay-" class="section-name selfRef">RFC 7197: Duplication Delay Attribute in SDP</a>
        </h3>
<p id="section-5.18-1"><span>[<a href="#RFC7197" class="xref">RFC7197</a>]</span> defines an attribute to
        indicate the presence of temporally redundant media streams
        and the duplication delay in SDP.<a href="#section-5.18-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7197-attribute-analysis"></span><table class="center" id="table-18">
          <caption>
<a href="#table-18" class="selfRef">Table 18</a>:
<a href="#name-rfc-7197-attribute-analysis" class="selfRef">RFC 7197 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">duplication-delay</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.19">
        <h3 id="name-rfc-7266-rtcp-xr-blocks-for">
<a href="#section-5.19" class="section-number selfRef">5.19. </a><a href="#name-rfc-7266-rtcp-xr-blocks-for" class="section-name selfRef">RFC 7266: RTCP XR Blocks for MOS Metric Reporting</a>
        </h3>
<p id="section-5.19-1"><span>[<a href="#RFC7266" class="xref">RFC7266</a>]</span> defines an RTCP Extended Report (XR) Block
        that includes two new segment types and associated SDP parameters that allow
        the reporting of mean opinion score (MOS) metrics for use in a
        range of RTP applications.<a href="#section-5.19-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7266-attribute-analysis"></span><table class="center" id="table-19">
          <caption>
<a href="#table-19" class="selfRef">Table 19</a>:
<a href="#name-rfc-7266-attribute-analysis" class="selfRef">RFC 7266 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">calgextmap</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.20">
        <h3 id="name-rfc-6285-rapid-acquisition-">
<a href="#section-5.20" class="section-number selfRef">5.20. </a><a href="#name-rfc-6285-rapid-acquisition-" class="section-name selfRef">RFC 6285: Rapid Acquisition of Multicast RTP Sessions</a>
        </h3>
<p id="section-5.20-1"><span>[<a href="#RFC6285" class="xref">RFC6285</a>]</span> describes a method of
        using the existing RTP and RTCP machinery that reduces the
        acquisition delay. In this method, an auxiliary unicast RTP
        session carrying the reference information to the receiver precedes or
        accompanies the multicast stream. This unicast RTP flow can
        be transmitted at a faster-than-natural bitrate to further
        accelerate the acquisition. The motivating use case for
        this capability is multicast applications that carry
        real-time compressed audio and video.<a href="#section-5.20-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6285-attribute-analysis"></span><table class="center" id="table-20">
          <caption>
<a href="#table-20" class="selfRef">Table 20</a>:
<a href="#name-rfc-6285-attribute-analysis" class="selfRef">RFC 6285 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rams-updates</td>
              <td class="text-left" rowspan="1" colspan="1">Not recommended
          </td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.21">
        <h3 id="name-rfc-6230-media-control-chan">
<a href="#section-5.21" class="section-number selfRef">5.21. </a><a href="#name-rfc-6230-media-control-chan" class="section-name selfRef">RFC 6230: Media Control Channel Framework</a>
        </h3>
<p id="section-5.21-1"><span>[<a href="#RFC6230" class="xref">RFC6230</a>]</span> describes a framework
        and protocol for application deployment where the
        application programming logic and media processing are
        distributed. This implies that application programming
        logic can seamlessly gain access to appropriate resources
        that are not co-located on the same physical network entity.
        The framework uses SIP to establish an application-level control
        mechanism between application servers and associated external
        servers such as media servers.<a href="#section-5.21-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6230-attribute-analysis"></span><table class="center" id="table-21">
          <caption>
<a href="#table-21" class="selfRef">Table 21</a>:
<a href="#name-rfc-6230-attribute-analysis" class="selfRef">RFC 6230 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cfw-id</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.22">
        <h3 id="name-rfc-6364-sdp-elements-for-f">
<a href="#section-5.22" class="section-number selfRef">5.22. </a><a href="#name-rfc-6364-sdp-elements-for-f" class="section-name selfRef">RFC 6364: SDP Elements for FEC Framework</a>
        </h3>
<p id="section-5.22-1"><span>[<a href="#RFC6364" class="xref">RFC6364</a>]</span> specifies the use of
        SDP to describe the parameters required to signal the
        Forward Error Correction (FEC) Framework Configuration
        Information between the sender(s) and receiver(s). This
        document also provides examples that show the semantics for
        grouping multiple source and repair flows together for the
        applications that simultaneously use multiple instances of the
        FEC Framework.<a href="#section-5.22-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6364-attribute-analysis"></span><table class="center" id="table-22">
          <caption>
<a href="#table-22" class="selfRef">Table 22</a>:
<a href="#name-rfc-6364-attribute-analysis" class="selfRef">RFC 6364 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fec-source-flow</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to the document defining specific
           FEC scheme.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fec-repair-flow</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to the document defining specific
           FEC scheme.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">repair-window</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to the document defining specific
          FEC scheme.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.23">
        <h3 id="name-rfc-4796-content-attribute">
<a href="#section-5.23" class="section-number selfRef">5.23. </a><a href="#name-rfc-4796-content-attribute" class="section-name selfRef">RFC 4796: "content" Attribute</a>
        </h3>
<p id="section-5.23-1"><span>[<a href="#RFC4796" class="xref">RFC4796</a>]</span> defines a new SDP media-level
        attribute, "content". The "content" attribute defines the
        content of the media stream to a more detailed level than
        the media description line. The sender of an SDP session
        description can attach the "content" attribute to one or more
        media streams. The receiving application can then treat each media
        stream differently (e.g., show it on a big or small screen) based
        on its content.<a href="#section-5.23-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4796-attribute-analysis"></span><table class="center" id="table-23">
          <caption>
<a href="#table-23" class="selfRef">Table 23</a>:
<a href="#name-rfc-4796-attribute-analysis" class="selfRef">RFC 4796 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">content</td>
              <td class="text-left" rowspan="1" colspan="1">Not
          impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.24">
        <h3 id="name-rfc-3407-sdp-simple-capabil">
<a href="#section-5.24" class="section-number selfRef">5.24. </a><a href="#name-rfc-3407-sdp-simple-capabil" class="section-name selfRef">RFC 3407: SDP Simple Capability Declaration</a>
        </h3>
<p id="section-5.24-1"><span>[<a href="#RFC3407" class="xref">RFC3407</a>]</span> defines a set of SDP attributes that enables
        SDP to provide a minimal and backwards-compatible capability
        declaration mechanism.<a href="#section-5.24-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3407-attribute-analysis"></span><table class="center" id="table-24">
          <caption>
<a href="#table-24" class="selfRef">Table 24</a>:
<a href="#name-rfc-3407-attribute-analysis" class="selfRef">RFC 3407 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">sqn</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cdsc</td>
              <td class="text-left" rowspan="1" colspan="1">Not
          impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cpar</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cparmin</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cparmax</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.24-3">
         NOTE: The attributes "a=cparmin" and "a=cparmax" define minimum
         and maximum numerical values associated with the attributes
         described in "a=cpar".<a href="#section-5.24-3" class="pilcrow">¶</a></p>
<p id="section-5.24-4">Since the cpar attribute can either define
         a "b=" attribute or any "a=" attribute, the multiplexing category
         depends on the actual attribute being encapsulated and the implications
         of the numerical values assigned. Hence it is recommended to consult
         the specification defining attributes "cparmin" and "cparmax" to further
         analyze their behavior under multiplexing.<a href="#section-5.24-4" class="pilcrow">¶</a></p>
</section>
<section id="section-5.25">
        <h3 id="name-rfc-6284-port-mapping-betwe">
<a href="#section-5.25" class="section-number selfRef">5.25. </a><a href="#name-rfc-6284-port-mapping-betwe" class="section-name selfRef">RFC 6284: Port Mapping between Unicast and Multicast RTP Sessions</a>
        </h3>
<p id="section-5.25-1"><span>[<a href="#RFC6284" class="xref">RFC6284</a>]</span> presents a port-mapping solution that
 allows RTP receivers to choose their
        own ports for an auxiliary unicast session in RTP
        applications using both unicast and multicast services. The
        solution provides protection against denial-of-service or
        packet amplification attacks that could be used to cause one
        or more RTP packets to be sent to a victim client.<a href="#section-5.25-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6284-attribute-analysis"></span><table class="center" id="table-25">
          <caption>
<a href="#table-25" class="selfRef">Table 25</a>:
<a href="#name-rfc-6284-attribute-analysis" class="selfRef">RFC 6284 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">portmapping-req</td>
              <td class="text-left" rowspan="1" colspan="1">Not recommended if port mapping is
          required by the application</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.26">
        <h3 id="name-rfc-6714-msrp-cema">
<a href="#section-5.26" class="section-number selfRef">5.26. </a><a href="#name-rfc-6714-msrp-cema" class="section-name selfRef">RFC 6714: MSRP-CEMA</a>
        </h3>
<p id="section-5.26-1"><span>[<a href="#RFC6714" class="xref">RFC6714</a>]</span> defines a Message
        Session Relay Protocol (MSRP) extension, Connection
        Establishment for Media Anchoring (CEMA). Support of this
        extension is optional. The extension allows middleboxes to
        anchor the MSRP connection without the need for middleboxes to modify
 the MSRP messages; thus, it also enables
        secure end-to-end MSRP communication in networks where such
        middleboxes are deployed. This document also defines an
        SDP attribute, "msrp-cema", that MSRP endpoints use to indicate
        support of the CEMA extension.<a href="#section-5.26-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6714-attribute-analysis"></span><table class="center" id="table-26">
          <caption>
<a href="#table-26" class="selfRef">Table 26</a>:
<a href="#name-rfc-6714-attribute-analysis" class="selfRef">RFC 6714 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">msrp-cema</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.26-3">NOTE: As per <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-9" class="relref">Section 9</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span>, there
         exists no publicly available specification that
         defines procedures for multiplexing/demultiplexing MSRP flows
         over a single 5-tuple. Once such a specification is available,
         the assignments of multiplexing categories for the attributes in this
         section could be revisited.<a href="#section-5.26-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.27">
        <h3 id="name-rfc-4583-sdp-format-for-bfc">
<a href="#section-5.27" class="section-number selfRef">5.27. </a><a href="#name-rfc-4583-sdp-format-for-bfc" class="section-name selfRef">RFC 4583: SDP Format for BFCP Streams</a>
        </h3>
<p id="section-5.27-1"><span>[<a href="#RFC4583" class="xref">RFC4583</a>]</span> specifies how
        to describe Binary Floor Control Protocol (BFCP) streams in
        SDP descriptions. User agents using the offer/answer model to
        establish BFCP streams use this format in their offers and answers.<a href="#section-5.27-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4583-attribute-analysis"></span><table class="center" id="table-27">
          <caption>
<a href="#table-27" class="selfRef">Table 27</a>:
<a href="#name-rfc-4583-attribute-analysis" class="selfRef">RFC 4583 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">floorctrl</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">confid</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">userid</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">floorid</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.27-3">NOTE: <span>[<a href="#RFC4583" class="xref">RFC4583</a>]</span> has been obsoleted by
 <span>[<a href="#RFC8856" class="xref">RFC8856</a>]</span>, which redefines the SDP attributes
 listed in this section, including the "Mux Category" values. However,
 <span>[<a href="#RFC8856" class="xref">RFC8856</a>]</span> does not change the "Mux Category"
 values of the attributes.<a href="#section-5.27-3" class="pilcrow">¶</a></p>
<p id="section-5.27-4">NOTE: As per <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-9" class="relref">Section 9</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span>, there exists no publicly available specification that
        defines procedures for multiplexing/demultiplexing BFCP streams over a
        single 5-tuple. Once such a specification is available, the
        assignments of multiplexing categories for the attributes in this
        section could be revisited.<a href="#section-5.27-4" class="pilcrow">¶</a></p>
</section>
<section id="section-5.28">
        <h3 id="name-rfc-5547-sdp-offer-answer-f">
<a href="#section-5.28" class="section-number selfRef">5.28. </a><a href="#name-rfc-5547-sdp-offer-answer-f" class="section-name selfRef">RFC 5547: SDP Offer/Answer for File Transfer</a>
        </h3>
<p id="section-5.28-1"><span>[<a href="#RFC5547" class="xref">RFC5547</a>]</span> provides a mechanism
        to negotiate the transfer of one or more files between two
        endpoints by using the SDP offer/answer model specified in
        <span>[<a href="#RFC3264" class="xref">RFC3264</a>]</span>.<a href="#section-5.28-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5547-attribute-analysis"></span><table class="center" id="table-28">
          <caption>
<a href="#table-28" class="selfRef">Table 28</a>:
<a href="#name-rfc-5547-attribute-analysis" class="selfRef">RFC 5547 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">file-selector</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">file-transfer-id</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">file-disposition</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">file-date</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">file-icon</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">file-range</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.28-3">NOTE: As per <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-9" class="relref">Section 9</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span>,
         there exists no publicly available specification that
         defines procedures for multiplexing/demultiplexing MSRP flows
         over a single 5-tuple. Once such a specification is available,
         the assignments of multiplexing categories for attributes in this
         section could be revisited.<a href="#section-5.28-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.29">
        <h3 id="name-rfc-6849-sdp-and-rtp-media-">
<a href="#section-5.29" class="section-number selfRef">5.29. </a><a href="#name-rfc-6849-sdp-and-rtp-media-" class="section-name selfRef">RFC 6849: SDP and RTP Media Loopback Extension</a>
        </h3>
<p id="section-5.29-1"><span>[<a href="#RFC6849" class="xref">RFC6849</a>]</span> adds new SDP media
        types and attributes that enable establishment of media
        sessions where the media is looped back to the
        transmitter. Such media sessions will serve as monitoring
        and troubleshooting tools by providing the means for
        measurement of more advanced Voice over IP (VoIP), real-time text,
        and Video over IP performance metrics.<a href="#section-5.29-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6849-analysis"></span><table class="center" id="table-29">
          <caption>
<a href="#table-29" class="selfRef">Table 29</a>:
<a href="#name-rfc-6849-analysis" class="selfRef">RFC 6849 Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">loopback rtp-pkt-loopback</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be
          same for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">loopback rtp-media-loopback</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be
          same for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">loopback-source</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">loopback-mirror</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.30">
        <h3 id="name-rfc-5760-rtcp-with-unicast-">
<a href="#section-5.30" class="section-number selfRef">5.30. </a><a href="#name-rfc-5760-rtcp-with-unicast-" class="section-name selfRef">RFC 5760: RTCP with Unicast Feedback</a>
        </h3>
<p id="section-5.30-1"><span>[<a href="#RFC5760" class="xref">RFC5760</a>]</span> specifies an extension
        to RTCP to use unicast feedback to a multicast sender. The proposed
        extension is useful for single-source multicast sessions
        such as source-specific multicast (SSM) communication where
        the traditional model of many-to-many group communication is
        either not available or not desired.<a href="#section-5.30-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5760-attribute-analysis"></span><table class="center" id="table-30">
          <caption>
<a href="#table-30" class="selfRef">Table 30</a>:
<a href="#name-rfc-5760-attribute-analysis" class="selfRef">RFC 5760 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp-unicast</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute <span class="bcp14">MUST</span> be reported
          across all multiplexed "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.31">
        <h3 id="name-rfc-3611-rtcp-xr">
<a href="#section-5.31" class="section-number selfRef">5.31. </a><a href="#name-rfc-3611-rtcp-xr" class="section-name selfRef">RFC 3611: RTCP XR</a>
        </h3>
<p id="section-5.31-1"><span>[<a href="#RFC3611" class="xref">RFC3611</a>]</span> defines the Extended
        Report (XR) packet type for RTCP and defines how the use of XR packets
 can be signaled by an
        application if it employs the Session Description Protocol
        (SDP).<a href="#section-5.31-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3611-attribute-analysis"></span><table class="center" id="table-31">
          <caption>
<a href="#table-31" class="selfRef">Table 31</a>:
<a href="#name-rfc-3611-attribute-analysis" class="selfRef">RFC 3611 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp-xr</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.32">
        <h3 id="name-rfc-5939-sdp-capability-neg">
<a href="#section-5.32" class="section-number selfRef">5.32. </a><a href="#name-rfc-5939-sdp-capability-neg" class="section-name selfRef">RFC 5939: SDP Capability Negotiation</a>
        </h3>
<p id="section-5.32-1"><span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> defines a general SDP
        Capability Negotiation framework. It also specifies how to
        provide attributes and transport protocols as capabilities
        and negotiate them using the framework. Extensions for
        other types of capabilities (e.g., media types and media
        formats) may be provided in other documents.<a href="#section-5.32-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5939-attribute-analysis"></span><table class="center" id="table-32">
          <caption>
<a href="#table-32" class="selfRef">Table 32</a>:
<a href="#name-rfc-5939-attribute-analysis" class="selfRef">RFC 5939 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">pcfg</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">acfg</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">csup</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted </td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">creq</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">acap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">tcap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cap-v0</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.33">
        <h3 id="name-rfc-6871-sdp-media-capabili">
<a href="#section-5.33" class="section-number selfRef">5.33. </a><a href="#name-rfc-6871-sdp-media-capabili" class="section-name selfRef">RFC 6871: SDP Media Capabilities Negotiation</a>
        </h3>
<p id="section-5.33-1">SDP capability negotiation provides a general framework
        for indicating and negotiating capabilities in SDP. The base
        framework only defines capabilities for negotiating transport
        protocols and attributes. <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> extends the
        framework by defining media capabilities that can be used to
        negotiate media types and their associated parameters.<a href="#section-5.33-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6871-attribute-analysis"></span><table class="center" id="table-33">
          <caption>
<a href="#table-33" class="selfRef">Table 33</a>:
<a href="#name-rfc-6871-attribute-analysis" class="selfRef">RFC 6871 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rmcap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omcap</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mfcap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mscap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">lcfg</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to <a href="#sec-encap" class="xref">Section 14</a>
</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">sescap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">med-v0</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.33-3">NOTE: The "sescap" attribute is not recommended
        for use with multiplexing. The reason is that it requires the
        use of unique configuration numbers across the entire SDP
        (per <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span>) as opposed to within a media
        description only (per <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span>). As described in
        <a href="#sec-encap" class="xref">Section 14</a>, the use of identical configuration
        numbers between multiplexed (bundled) media descriptions is the
        default way of indicating compatible configurations in a bundle.<a href="#section-5.33-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.34">
        <h3 id="name-rfc-7006-miscellaneous-capa">
<a href="#section-5.34" class="section-number selfRef">5.34. </a><a href="#name-rfc-7006-miscellaneous-capa" class="section-name selfRef">RFC 7006: Miscellaneous Capabilities Negotiation in SDP</a>
        </h3>
<p id="section-5.34-1"><span>[<a href="#RFC7006" class="xref">RFC7006</a>]</span> extends the SDP Capability Negotiation
        framework to allow endpoints to negotiate three additional SDP
        capabilities. In particular, this memo provides a mechanism to
        negotiate bandwidth ("b=" line), connection data ("c=" line), and
        session or media titles ("i=" line for each session or media).<a href="#section-5.34-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7006-attribute-analysis"></span><table class="center" id="table-34">
          <caption>
<a href="#table-34" class="selfRef">Table 34</a>:
<a href="#name-rfc-7006-attribute-analysis" class="selfRef">RFC 7006 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bcap</td>
              <td class="text-left" rowspan="1" colspan="1">Inherit the category SUM as
          applicable to the "b=" attribute</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bcap-v0</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccap</td>
              <td class="text-left" rowspan="1" colspan="1">The connection address type
          <span class="bcp14">MUST</span> be identical across all the multiplexed
          "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccap-v0</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">icap</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">icap-v0</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.35">
        <h3 id="name-rfc-4567-key-management-ext">
<a href="#section-5.35" class="section-number selfRef">5.35. </a><a href="#name-rfc-4567-key-management-ext" class="section-name selfRef">RFC 4567: Key Management Extensions for SDP and RTSP</a>
        </h3>
<p id="section-5.35-1"><span>[<a href="#RFC4567" class="xref">RFC4567</a>]</span> defines general
        extensions for SDP and Real-Time Streaming Protocol (RTSP) to
        carry messages, as specified by a key management protocol, in
        order to secure the media. These extensions are presented as
        a framework to be used by one or more key management protocols. As
        such, their use is meaningful only when complemented by an
        appropriate key management protocol.<a href="#section-5.35-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4567-attribute-analysis"></span><table class="center" id="table-35">
          <caption>
<a href="#table-35" class="selfRef">Table 35</a>:
<a href="#name-rfc-4567-attribute-analysis" class="selfRef">RFC 4567 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">key-mgmt</td>
              <td class="text-left" rowspan="1" colspan="1">Key management protocol <span class="bcp14">MUST</span> be
          identical across all the "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mikey</td>
              <td class="text-left" rowspan="1" colspan="1">Key management protocol <span class="bcp14">MUST</span> be
          identical across all the "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.36">
        <h3 id="name-rfc-4572-comedia-over-tls-i">
<a href="#section-5.36" class="section-number selfRef">5.36. </a><a href="#name-rfc-4572-comedia-over-tls-i" class="section-name selfRef">RFC 4572: Comedia over TLS in SDP</a>
        </h3>
<p id="section-5.36-1"><span>[<a href="#RFC4572" class="xref">RFC4572</a>]</span> specifies how to
        establish secure connection-oriented media transport
        sessions over the Transport Layer Security (TLS) protocol
        using SDP. (Note: <span>[<a href="#RFC4572" class="xref">RFC4572</a>]</span> has been obsoleted by <span>[<a href="#RFC8122" class="xref">RFC8122</a>]</span>.) It defines a
        new SDP protocol identifier, "TCP/TLS". It also defines the
        syntax and semantics for an SDP "fingerprint" attribute that
        identifies the certificate that will be presented for the
        TLS session. This mechanism allows media transport over TLS
        connections to be established securely, so long as the
        integrity of session descriptions is assured.<a href="#section-5.36-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4572-attribute-analysis"></span><table class="center" id="table-36">
          <caption>
<a href="#table-36" class="selfRef">Table 36</a>:
<a href="#name-rfc-4572-attribute-analysis" class="selfRef">RFC 4572 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fingerprint</td>
              <td class="text-left" rowspan="1" colspan="1">fingerprint value <span class="bcp14">MUST</span> be the
          one that corresponds to the "m=" line chosen for 
          setting up the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.37">
        <h3 id="name-rfc-4570-sdp-source-filters">
<a href="#section-5.37" class="section-number selfRef">5.37. </a><a href="#name-rfc-4570-sdp-source-filters" class="section-name selfRef">RFC 4570: SDP Source Filters</a>
        </h3>
<p id="section-5.37-1"><span>[<a href="#RFC4570" class="xref">RFC4570</a>]</span> describes how to adapt
        SDP to express one or more source addresses as a source
        filter for one or more destination "connection" addresses.
        It defines the syntax and semantics for an SDP "source-filter"
        attribute that may reference either IPv4 or IPv6 address(es) as
        either an inclusive or exclusive source list for either multicast or
        unicast destinations. In particular, an inclusive source filter can be
 used to specify a source-specific multicast (SSM) session.<a href="#section-5.37-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4570-attribute-analysis"></span><table class="center" id="table-37">
          <caption>
<a href="#table-37" class="selfRef">Table 37</a>:
<a href="#name-rfc-4570-attribute-analysis" class="selfRef">RFC 4570 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">source-filter</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute <span class="bcp14">MUST</span> be repeated
          across all multiplexed "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.38">
        <h3 id="name-rfc-6128-rtcp-port-for-mult">
<a href="#section-5.38" class="section-number selfRef">5.38. </a><a href="#name-rfc-6128-rtcp-port-for-mult" class="section-name selfRef">RFC 6128: RTCP Port for Multicast Sessions</a>
        </h3>
<p id="section-5.38-1">SDP has an attribute that allows RTP applications to specify
        an address and a port associated with the RTCP traffic. In
        RTP-based source-specific multicast (SSM) sessions, the same
        attribute is used to designate the address and the RTCP port
        of the Feedback Target in the SDP description. However, the
        RTCP port associated with the SSM session itself cannot be
        specified by the same attribute to avoid ambiguity and
        thus is required to be derived from the "m=" line of the
        media description. Deriving the RTCP port from the "m="
        line imposes an unnecessary restriction. <span>[<a href="#RFC6128" class="xref">RFC6128</a>]</span>
        removes this restriction by introducing a new SDP attribute.<a href="#section-5.38-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6128-attribute-analysis"></span><table class="center" id="table-38">
          <caption>
<a href="#table-38" class="selfRef">Table 38</a>:
<a href="#name-rfc-6128-attribute-analysis" class="selfRef">RFC 6128 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">multicast-rtcp</td>
              <td class="text-left" rowspan="1" colspan="1">Multicast RTCP port <span class="bcp14">MUST</span> be
          identical across all the
          "m=" lines.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.39">
        <h3 id="name-rfc-6189-zrtp">
<a href="#section-5.39" class="section-number selfRef">5.39. </a><a href="#name-rfc-6189-zrtp" class="section-name selfRef">RFC 6189: ZRTP</a>
        </h3>
<p id="section-5.39-1"><span>[<a href="#RFC6189" class="xref">RFC6189</a>]</span> defines ZRTP, a protocol for media
        path Diffie-Hellman exchange to agree on a session key and
        parameters for establishing unicast SRTP sessions for VoIP applications.<a href="#section-5.39-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6189-attribute-analysis"></span><table class="center" id="table-39">
          <caption>
<a href="#table-39" class="selfRef">Table 39</a>:
<a href="#name-rfc-6189-attribute-analysis" class="selfRef">RFC 6189 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">zrtp-hash</td>
              <td class="text-left" rowspan="1" colspan="1">The zrtp-hash attribute <span class="bcp14">MUST</span> be the one
          that corresponds to the "m=" line chosen for setting up
          the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.40">
        <h3 id="name-rfc-4145-connection-oriente">
<a href="#section-5.40" class="section-number selfRef">5.40. </a><a href="#name-rfc-4145-connection-oriente" class="section-name selfRef">RFC 4145: Connection-Oriented Media</a>
        </h3>
<p id="section-5.40-1"><span>[<a href="#RFC4145" class="xref">RFC4145</a>]</span> describes how to
        express media transport over TCP using SDP. It defines
        the SDP "TCP" protocol identifier, the SDP "setup" attribute,
        which describes the connection setup procedure, and the SDP
        "connection" attribute, which handles connection
        re-establishment.<a href="#section-5.40-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4145-attribute-analysis"></span><table class="center" id="table-40">
          <caption>
<a href="#table-40" class="selfRef">Table 40</a>:
<a href="#name-rfc-4145-attribute-analysis" class="selfRef">RFC 4145 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">setup</td>
              <td class="text-left" rowspan="1" colspan="1">The setup attribute <span class="bcp14">MUST</span> be the one that corresponds to the "m="
          line chosen for setting up the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">connection</td>
              <td class="text-left" rowspan="1" colspan="1">The connection attribute <span class="bcp14">MUST</span> be the one that corresponds to the
          "m=" line chosen for setting up the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.41">
        <h3 id="name-rfc-6947-the-sdp-altc-attri">
<a href="#section-5.41" class="section-number selfRef">5.41. </a><a href="#name-rfc-6947-the-sdp-altc-attri" class="section-name selfRef">RFC 6947: The SDP "altc" Attribute</a>
        </h3>
<p id="section-5.41-1"><span>[<a href="#RFC6947" class="xref">RFC6947</a>]</span> proposes a mechanism that allows
        the same SDP offer to carry multiple IP addresses of different
        address families (e.g., IPv4 and IPv6). The proposed "altc" attribute
 solves the backward-compatibility problem
        that plagued Alternative Network Address Types (ANAT) due to
        their syntax.<a href="#section-5.41-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6947-attribute-analysis"></span><table class="center" id="table-41">
          <caption>
<a href="#table-41" class="selfRef">Table 41</a>:
<a href="#name-rfc-6947-attribute-analysis" class="selfRef">RFC 6947 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">altc</td>
              <td class="text-left" rowspan="1" colspan="1">The IP address and port <span class="bcp14">MUST</span> be the ones
          that correspond to the "m=" line chosen for setting up the
          underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.42">
        <h3 id="name-rfc-7195-sdp-extension-for-">
<a href="#section-5.42" class="section-number selfRef">5.42. </a><a href="#name-rfc-7195-sdp-extension-for-" class="section-name selfRef">RFC 7195: SDP Extension for Circuit-Switched Bearers         in PSTN</a>
        </h3>
<p id="section-5.42-1"><span>[<a href="#RFC7195" class="xref">RFC7195</a>]</span> describes use cases, requirements, and
        protocol extensions for using the SDP offer/answer model for establishing
        audio and video media streams over circuit-switched bearers in the
        Public Switched Telephone Network (PSTN).<a href="#section-5.42-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7195-attribute-analysis"></span><table class="center" id="table-42">
          <caption>
<a href="#table-42" class="selfRef">Table 42</a>:
<a href="#name-rfc-7195-attribute-analysis" class="selfRef">RFC 7195 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cs-correlation:callerid</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cs-correlation:uuie</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cs-correlation:dtmf</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cs-correlation:external</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.42-3">NOTE: <span>[<a href="#RFC7195" class="xref">RFC7195</a>]</span> defines SDP attributes for
         establishing audio and video media streams over circuit-switched
         bearers by defining a new nettype value, "PSTN". However, 
         <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-7.2" class="relref">Section 7.2</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span> requires the
         "c=" line nettype value to be "IN". If there exists in future a specification
         that defines procedures to multiplex media streams over nettype "PSTN",
         the multiplexing categories for attributes in this section could be
         revisited.<a href="#section-5.42-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.43">
        <h3 id="name-rfc-7272-idms-using-the-rtp">
<a href="#section-5.43" class="section-number selfRef">5.43. </a><a href="#name-rfc-7272-idms-using-the-rtp" class="section-name selfRef">RFC 7272: IDMS Using the RTP Control Protocol (RTCP)</a>
        </h3>
<p id="section-5.43-1"><span>[<a href="#RFC7272" class="xref">RFC7272</a>]</span> defines a new RTCP packet type and an
        RTCP Extended Report (XR) Block Type to be used for achieving
        Inter-Destination Media Synchronization (IDMS).<a href="#section-5.43-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7272-attribute-analysis"></span><table class="center" id="table-43">
          <caption>
<a href="#table-43" class="selfRef">Table 43</a>:
<a href="#name-rfc-7272-attribute-analysis" class="selfRef">RFC 7272 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtcp-idms</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.44">
        <h3 id="name-rfc-5159-open-mobile-allian">
<a href="#section-5.44" class="section-number selfRef">5.44. </a><a href="#name-rfc-5159-open-mobile-allian" class="section-name selfRef">RFC 5159: Open Mobile Alliance (OMA) Broadcast (BCAST) SDP Attributes</a>
        </h3>
<p id="section-5.44-1"><span>[<a href="#RFC5159" class="xref">RFC5159</a>]</span> provides descriptions
        of SDP attributes used by the
        Open Mobile Alliance's "Service and Content Protection for Mobile
        Broadcast Services" specification.<a href="#section-5.44-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5159-attribute-analysis"></span><table class="center" id="table-44">
          <caption>
<a href="#table-44" class="selfRef">Table 44</a>:
<a href="#name-rfc-5159-attribute-analysis" class="selfRef">RFC 5159 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bcastversion</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">stkmstream</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">SRTPAuthentication</td>
              <td class="text-left" rowspan="1" colspan="1">Needs further analysis</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">SRTPROCTxRate</td>
              <td class="text-left" rowspan="1" colspan="1">Needs further analysis</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.45">
        <h3 id="name-rfc-6193-media-description-">
<a href="#section-5.45" class="section-number selfRef">5.45. </a><a href="#name-rfc-6193-media-description-" class="section-name selfRef">RFC 6193: Media Description for IKE in SDP</a>
        </h3>
<p id="section-5.45-1"><span>[<a href="#RFC6193" class="xref">RFC6193</a>]</span> specifies how to
        establish a media session that represents a virtual private
        network using the Session Initiation Protocol for the
        purpose of on-demand media/application sharing between
        peers. It extends the protocol identifier of SDP so that it can
        negotiate use of the Internet Key Exchange Protocol (IKE) for
        media sessions in the SDP offer/answer model.<a href="#section-5.45-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6193-attribute-analysis"></span><table class="center" id="table-45">
          <caption>
<a href="#table-45" class="selfRef">Table 45</a>:
<a href="#name-rfc-6193-attribute-analysis" class="selfRef">RFC 6193 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ike-setup</td>
              <td class="text-left" rowspan="1" colspan="1">Unlikely to use IKE in the context of
          multiplexing</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">psk-fingerprint</td>
              <td class="text-left" rowspan="1" colspan="1">Unlikely to use IKE in the context of
          multiplexing</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ike-esp</td>
              <td class="text-left" rowspan="1" colspan="1">Unlikely to use IKE in the context of
          multiplexing</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ike-esp-udpencap</td>
              <td class="text-left" rowspan="1" colspan="1">Unlikely to use IKE in the context of
          multiplexing</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.46">
        <h3 id="name-rfc-2326-real-time-streamin">
<a href="#section-5.46" class="section-number selfRef">5.46. </a><a href="#name-rfc-2326-real-time-streamin" class="section-name selfRef">RFC 2326: Real Time Streaming Protocol</a>
        </h3>
<p id="section-5.46-1">The Real Time Streaming Protocol, or RTSP, is an application-level
        protocol for control over the delivery of data with real-time
        properties. RTSP provides an extensible framework to enable
        controlled, on-demand delivery of real-time data, such as audio
        and video.<a href="#section-5.46-1" class="pilcrow">¶</a></p>
<span id="name-rfc-2326-attribute-analysis"></span><table class="center" id="table-46">
          <caption>
<a href="#table-46" class="selfRef">Table 46</a>:
<a href="#name-rfc-2326-attribute-analysis" class="selfRef">RFC 2326 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">etag</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 2326 is obsolete.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">range</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 2326 is obsolete.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">control</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 2326 is obsolete.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mtag</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 2326 is obsolete.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.46-3">NOTE: <span>[<a href="#RFC2326" class="xref">RFC2326</a>]</span> defines SDP attributes that are
         applicable in the declarative usage of SDP alone. For the
         purposes of this document, only the offer/answer usage of SDP
         is considered to be mandated by <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>.<a href="#section-5.46-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.47">
        <h3 id="name-rfc-7826-real-time-streamin">
<a href="#section-5.47" class="section-number selfRef">5.47. </a><a href="#name-rfc-7826-real-time-streamin" class="section-name selfRef">RFC 7826: Real-Time Streaming Protocol</a>
        </h3>
<p id="section-5.47-1">The Real-Time Streaming Protocol, or RTSP, is an application-level
        protocol for control over the delivery of data with real-time
        properties. RTSP provides an extensible framework to enable
        controlled, on-demand delivery of real-time data, such as audio
        and video.<a href="#section-5.47-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7826-attribute-analysis"></span><table class="center" id="table-47">
          <caption>
<a href="#table-47" class="selfRef">Table 47</a>:
<a href="#name-rfc-7826-attribute-analysis" class="selfRef">RFC 7826 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">range</td>
              <td class="text-left" rowspan="1" colspan="1">RTSP is not supported for RTP stream
          multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">control</td>
              <td class="text-left" rowspan="1" colspan="1">RTSP is not supported for RTP stream
          multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mtag</td>
              <td class="text-left" rowspan="1" colspan="1">RTSP is not supported for RTP stream
          multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.47-3">NOTE: <span>[<a href="#RFC7826" class="xref">RFC7826</a>]</span> defines SDP attributes that are
         applicable in the declarative usage of SDP alone. For the
         purposes of this document, only the offer/answer usage of SDP
         is considered to be mandated by <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>.<a href="#section-5.47-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.48">
        <h3 id="name-rfc-6064-sdp-and-rtsp-exten">
<a href="#section-5.48" class="section-number selfRef">5.48. </a><a href="#name-rfc-6064-sdp-and-rtsp-exten" class="section-name selfRef">RFC 6064: SDP and RTSP Extensions for 3GPP</a>
        </h3>
<p id="section-5.48-1">The Packet-switched Streaming Service (PSS) and the
        Multimedia Broadcast/Multicast Service (MBMS) defined by
        3GPP use SDP and RTSP with some extensions. <span>[<a href="#RFC6064" class="xref">RFC6064</a>]</span> provides information about
        these extensions and registers the RTSP and SDP extensions
        with IANA.<a href="#section-5.48-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6064-attribute-analysis"></span><table class="center" id="table-48">
          <caption>
<a href="#table-48" class="selfRef">Table 48</a>:
<a href="#name-rfc-6064-attribute-analysis" class="selfRef">RFC 6064 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">X-predecbufsize</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">X-initpredecbufperiod</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">X-initpostdecbufperiod</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">X-decbyterate</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3gpp-videopostdecbufsize</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">framesize</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-Integrity-Key</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-SDP-Auth</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-SRTP-Config</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">alt</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">alt-default-id</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">alt-group</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-Adaptation-Support</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-Asset-Information</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mbms-mode</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mbms-flowid</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">mbms-repair</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Corruption duration</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Rebuffering duration</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Initial buffering duration</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Successive loss of RTP packets</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Frame rate deviation</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Jitter duration</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Content Switch Time</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Average Codec Bitrate</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Codec Information</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics:Buffer Status</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.48-3">NOTE: <span>[<a href="#RFC6064" class="xref">RFC6064</a>]</span> defines SDP attributes that are
         applicable in the declarative usage of SDP alone. For the
         purposes of this document, only the offer/answer usage of SDP
         is considered to be mandated by <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>.<a href="#section-5.48-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.49">
        <h3 id="name-rfc-3108-atm-sdp">
<a href="#section-5.49" class="section-number selfRef">5.49. </a><a href="#name-rfc-3108-atm-sdp" class="section-name selfRef">RFC 3108: ATM SDP</a>
        </h3>
<p id="section-5.49-1"><span>[<a href="#RFC3108" class="xref">RFC3108</a>]</span> describes conventions
        for using SDP described for controlling ATM bearer connections
        and any associated ATM Adaptation Layer (AAL).<a href="#section-5.49-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3108-attribute-analysis"></span><table class="center" id="table-49">
          <caption>
<a href="#table-49" class="selfRef">Table 49</a>:
<a href="#name-rfc-3108-attribute-analysis" class="selfRef">RFC 3108 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aalType</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">eecid</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">capability</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">qosClass</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bcob</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">stc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">upcc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">atmQOSparms</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">atmTrfcDesc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">abrParms</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">abrSetup</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bearerType</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">lij</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">anycast</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cache</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bearerSigIE</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aalApp</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cbrRate</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">sbc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">clkrec</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fec</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">prtfl</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">structure</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">cpsSDUsize</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aal2CPS</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aal2CPSSDUrate</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aal2sscs3661unassured</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aal2sscs3661assured</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aal2sscs3662</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">aal5sscop</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">atmmap</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">silenceSupp</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ecan</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">gc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">profileDesc</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">vsel</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">dsel</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">fsel</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">onewaySel</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">codecconfig</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">isup_usi</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">uiLayer1_Prot</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">chain</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.49-3">NOTE: RFC 3108 describes conventions for using SDP for
        characterizing ATM bearer connections using an AAL1, AAL2, or
        AAL5 adaptation layer. For AAL1, AAL2, and AAL5, bearer
        connections can be used to transport single media streams.
        In addition, for AAL1 and AAL2, multiple media streams can be
        multiplexed into a bearer connection. For all adaptation types
        (AAL1, AAL2, and AAL5), bearer connections can be bundled into a single media
        group. In all cases addressed by RFC 3108, a real-time media
        stream (voice, video, voiceband data, pseudowire, and others)
        or a multiplex of media streams is mapped directly into an ATM
        connection. RFC 3108 does not address cases where ATM serves
        as a low-level transport pipe for IP packets that can, in turn,
        carry one or more real-time (e.g., VoIP) media sessions with a
        life cycle different from that of the underlying ATM
        transport.<a href="#section-5.49-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.50">
        <h3 id="name-3gpp-ts-183063">
<a href="#section-5.50" class="section-number selfRef">5.50. </a><a href="#name-3gpp-ts-183063" class="section-name selfRef">3GPP TS 183.063</a>
        </h3>
<p id="section-5.50-1">
          <span>[<a href="#TISPAN" class="xref">TISPAN</a>]</span> describes Telecommunications and Internet
          converged Services and Protocols for Advanced Networking (TISPAN);<a href="#section-5.50-1" class="pilcrow">¶</a></p>
<span id="name-3gpp-ts-183063-attribute-an"></span><table class="center" id="table-50">
          <caption>
<a href="#table-50" class="selfRef">Table 50</a>:
<a href="#name-3gpp-ts-183063-attribute-an" class="selfRef">3GPP TS 183.063 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">PSCid</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bc_service</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bc_program</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bc_service_package</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.51">
        <h3 id="name-3gpp-ts-24229">
<a href="#section-5.51" class="section-number selfRef">5.51. </a><a href="#name-3gpp-ts-24229" class="section-name selfRef">3GPP TS 24.229</a>
        </h3>
<p id="section-5.51-1">
         <span>[<a href="#IP-CALL" class="xref">IP-CALL</a>]</span> specifies an IP multimedia call
         control protocol based on Session Initial protocol and
         Session Description Protocol.<a href="#section-5.51-1" class="pilcrow">¶</a></p>
<span id="name-3gpp-ts-24229-attribute-ana"></span><table class="center" id="table-51">
          <caption>
<a href="#table-51" class="selfRef">Table 51</a>:
<a href="#name-3gpp-ts-24229-attribute-ana" class="selfRef">3GPP TS 24.229 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">secondary-realm</td>
              <td class="text-left" rowspan="1" colspan="1">secondary-realm  <span class="bcp14">MUST</span> be the one that corresponds
          to the "m=" line chosen for setting up the underlying
          transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">visited-realm</td>
              <td class="text-left" rowspan="1" colspan="1">visited-realm <span class="bcp14">MUST</span> be the one that corresponds
          to the "m=" line chosen for setting up the underlying
          transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-m-cksum</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-s-cksum</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-m-att</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-s-att</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-m-bw</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-s-bw</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">omr-codecs</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.52">
        <h3 id="name-itu-t38">
<a href="#section-5.52" class="section-number selfRef">5.52. </a><a href="#name-itu-t38" class="section-name selfRef">ITU T.38</a>
        </h3>
<p id="section-5.52-1">
         <span>[<a href="#T.38" class="xref">T.38</a>]</span> defines procedures for
         real-time Group 3 facsimile communications over IP networks.<a href="#section-5.52-1" class="pilcrow">¶</a></p>
<span id="name-itu-t38-attribute-analysis"></span><table class="center" id="table-52">
          <caption>
<a href="#table-52" class="selfRef">Table 52</a>:
<a href="#name-itu-t38-attribute-analysis" class="selfRef">ITU T.38 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxVersion</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38MaxBitRate</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxFillBitRemoval</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxTranscodingMMR</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxTranscodingJBIG</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxRateManagement</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxMaxBuffer</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxMaxDatagram</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxUdpEC</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxMaxIFP</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxUdpECDepth</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38FaxUdpFECMaxSpan</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38ModemType</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">T38VendorInfo</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.52-3">NOTE: As per <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-9" class="relref">Section 9</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span>,
          there exists no publicly available specification that defines
          procedures for multiplexing/demultiplexing fax protocol flows over a
          single 5-tuple. Once such a specification is available, the multiplexing
          category assignments for the attributes in this section could be revisited.<a href="#section-5.52-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.53">
        <h3 id="name-itu-t-q1970">
<a href="#section-5.53" class="section-number selfRef">5.53. </a><a href="#name-itu-t-q1970" class="section-name selfRef">ITU-T Q.1970</a>
        </h3>
<p id="section-5.53-1">
         <span>[<a href="#Q.1970" class="xref">Q.1970</a>]</span> defines Bearer Independent Call Control (BICC)
         IP bearer control protocol.<a href="#section-5.53-1" class="pilcrow">¶</a></p>
<span id="name-itu-t-q1970-attribute-analy"></span><table class="center" id="table-53">
          <caption>
<a href="#table-53" class="selfRef">Table 53</a>:
<a href="#name-itu-t-q1970-attribute-analy" class="selfRef">ITU-T Q.1970 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ipbcp</td>
              <td class="text-left" rowspan="1" colspan="1">ipbcp version identifies the types of
          IP bearer control protocol (IPBCP) message used in BICC (ITU-T Q.1901)
          environment that are limited to single-media payload. Refer to the pertinent
          ITU-T specifications while multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.54">
        <h3 id="name-itu-t-h24815">
<a href="#section-5.54" class="section-number selfRef">5.54. </a><a href="#name-itu-t-h24815" class="section-name selfRef">ITU-T H.248.15</a>
        </h3>
<p id="section-5.54-1">
          ITU-T H.248.15 <span>[<a href="#H.248.15" class="xref">H.248.15</a>]</span> defines the Gateway Control Protocol
          SDP H.248 package attribute.<a href="#section-5.54-1" class="pilcrow">¶</a></p>
<span id="name-itu-t-h24815-attribute-anal"></span><table class="center" id="table-54">
          <caption>
<a href="#table-54" class="selfRef">Table 54</a>:
<a href="#name-itu-t-h24815-attribute-anal" class="selfRef">ITU-T H.248.15 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">h248item</td>
              <td class="text-left" rowspan="1" colspan="1">It is only applicable for
          signaling the inclusion of H.248 extension packages to a
          gateway via the local and remote descriptors. The attribute
          itself is unaffected by multiplexing, but the package
          referenced in a specific use of the attribute can be
          impacted. Further analysis of each package is needed to
          determine if there is an issue. This is only a concern in
          environments using a decomposed server/gateway with H.248
          signaled between them. The ITU-T will need to do further
          analysis of various packages when they specify how to signal
          the use of multiplexing to a gateway.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-5.55">
        <h3 id="name-rfc-4975-the-message-sessio">
<a href="#section-5.55" class="section-number selfRef">5.55. </a><a href="#name-rfc-4975-the-message-sessio" class="section-name selfRef">RFC 4975: The Message Session Relay Protocol</a>
        </h3>
<p id="section-5.55-1"><span>[<a href="#RFC4975" class="xref">RFC4975</a>]</span> describes the Message Session
        Relay Protocol, a protocol for transmitting a series of
        related instant messages in the context of a session.
        Message sessions are treated like any other media stream
        when set up via a rendezvous or session-creation protocol
        such as the Session Initiation Protocol.<a href="#section-5.55-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4975-attribute-analysis"></span><table class="center" id="table-55">
          <caption>
<a href="#table-55" class="selfRef">Table 55</a>:
<a href="#name-rfc-4975-attribute-analysis" class="selfRef">RFC 4975 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">accept-types</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">accept-wrapped-types</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">max-size</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">path</td>
              <td class="text-left" rowspan="1" colspan="1">Refer to notes below</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
            </tr>
          </tbody>
        </table>
<p id="section-5.55-3">NOTE: As per 
         <span><a href="https://www.rfc-editor.org/rfc/rfc8843#section-9" class="relref">Section 9</a> of [<a href="#RFC8843" class="xref">RFC8843</a>]</span>,
         there exists no publicly available specification that
         defines procedures for multiplexing/demultiplexing MSRP flows over
         a single 5-tuple. Once such a specification is available, the multiplexing
         categories assignments for the attributes in this section could be revisited.<a href="#section-5.55-3" class="pilcrow">¶</a></p>
</section>
<section id="section-5.56">
        <h3 id="name-historical-attributes">
<a href="#section-5.56" class="section-number selfRef">5.56. </a><a href="#name-historical-attributes" class="section-name selfRef">Historical Attributes</a>
        </h3>
<p id="section-5.56-1">
          This section specifies analysis for the attributes that are
          included for historic usage alone by the <span>[<a href="#IANA" class="xref">IANA</a>]</span>.<a href="#section-5.56-1" class="pilcrow">¶</a></p>
<span id="name-historical-attribute-analys"></span><table class="center" id="table-56">
          <caption>
<a href="#table-56" class="selfRef">Table 56</a>:
<a href="#name-historical-attribute-analys" class="selfRef">Historical Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtpred1</td>
              <td class="text-left" rowspan="1" colspan="1">Historic attributes</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rtpred2</td>
              <td class="text-left" rowspan="1" colspan="1">Historic attributes</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="SecbwtypeAnalysis">
<section id="section-6">
      <h2 id="name-bwtype-attribute-analysis">
<a href="#section-6" class="section-number selfRef">6. </a><a href="#name-bwtype-attribute-analysis" class="section-name selfRef">bwtype Attribute Analysis</a>
      </h2>
<p id="section-6-1">This section specifies handling of specific bandwidth attributes
      when used in multiplexing scenarios.<a href="#section-6-1" class="pilcrow">¶</a></p>
<section id="section-6.1">
        <h3 id="name-rfc-4566-sdp-2">
<a href="#section-6.1" class="section-number selfRef">6.1. </a><a href="#name-rfc-4566-sdp-2" class="section-name selfRef">RFC 4566: SDP</a>
        </h3>
<p id="section-6.1-1"><span>[<a href="#RFC4566" class="xref">RFC4566</a>]</span> defines SDP that is intended for describing
      multimedia sessions for the purposes of session announcement,
      session invitation, and other forms of multimedia session
      initiation.<a href="#section-6.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4566-bwtype-analysis"></span><table class="center" id="table-57">
          <caption>
<a href="#table-57" class="selfRef">Table 57</a>:
<a href="#name-rfc-4566-bwtype-analysis" class="selfRef">RFC 4566 bwtype Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bwtype:CT</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bwtype:AS</td>
              <td class="text-left" rowspan="1" colspan="1"> For media-level usage,
         the aggregate of individual bandwidth values is considered.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SUM</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-6.2">
        <h3 id="name-rfc-3556-sdp-bandwidth-modi">
<a href="#section-6.2" class="section-number selfRef">6.2. </a><a href="#name-rfc-3556-sdp-bandwidth-modi" class="section-name selfRef">RFC 3556: SDP Bandwidth Modifiers for RTCP Bandwidth</a>
        </h3>
<p id="section-6.2-1"><span>[<a href="#RFC3556" class="xref">RFC3556</a>]</span> defines an extension to
        SDP to specify two additional modifiers for the bandwidth attribute. These
        modifiers may be used to specify the bandwidth allowed for
        RTCP packets in an RTP session.<a href="#section-6.2-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3556-bwtype-analysis"></span><table class="center" id="table-58">
          <caption>
<a href="#table-58" class="selfRef">Table 58</a>:
<a href="#name-rfc-3556-bwtype-analysis" class="selfRef">RFC 3556 bwtype Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bwtype:RS</td>
              <td class="text-left" rowspan="1" colspan="1">Session-level usage represents
         session aggregate, and media-level usage indicates SUM of the
         individual values while multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SUM</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bwtype:RR</td>
              <td class="text-left" rowspan="1" colspan="1">Session-level usage represents
         session aggregate, and media-level usage indicates SUM of the
         individual values while multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SUM</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-6.3">
        <h3 id="name-rfc-3890-bandwidth-modifier">
<a href="#section-6.3" class="section-number selfRef">6.3. </a><a href="#name-rfc-3890-bandwidth-modifier" class="section-name selfRef">RFC 3890: Bandwidth Modifier for SDP</a>
        </h3>
<p id="section-6.3-1"><span>[<a href="#RFC3890" class="xref">RFC3890</a>]</span> defines SDP Transport Independent Application
        Specific Maximum (TIAS) bandwidth modifier that does not
        include transport overhead; instead, an additional packet-rate
        attribute is defined. The transport-independent bitrate
        value together with the maximum packet rate can then be used
        to calculate the real bitrate over the transport actually
        used.<a href="#section-6.3-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3890-bwtype-analysis"></span><table class="center" id="table-59">
          <caption>
<a href="#table-59" class="selfRef">Table 59</a>:
<a href="#name-rfc-3890-bwtype-analysis" class="selfRef">RFC 3890 bwtype Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">bwtype:TIAS</td>
              <td class="text-left" rowspan="1" colspan="1">The usage of TIAS is not
         defined under offer/answer usage.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">maxprate</td>
              <td class="text-left" rowspan="1" colspan="1">The usage of TIAS and maxprate
         is not well defined under multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
          </tbody>
        </table>
<p id="section-6.3-3">NOTE: The intention of TIAS is that the media-level bitrate is
       multiplied with the known per-packet overhead
       for the selected transport and the maxprate value to determine
       the worst-case bitrate from the transport to more accurately
       capture the required usage. Summing TIAS values independently
       across "m=" lines and multiplying the computed sum with maxprate
       and the per-packet overhead would inflate the value
       significantly. Instead, performing multiplication and adding the
       individual values is a more appropriate usage.<a href="#section-6.3-3" class="pilcrow">¶</a></p>
</section>
</section>
</div>
<div id="SecrtcpfbAnalysis">
<section id="section-7">
      <h2 id="name-rtcp-fb-attribute-analysis">
<a href="#section-7" class="section-number selfRef">7. </a><a href="#name-rtcp-fb-attribute-analysis" class="section-name selfRef">rtcp-fb Attribute Analysis</a>
      </h2>
<p id="section-7-1">
      This section analyzes rtcp-fb SDP attributes.<a href="#section-7-1" class="pilcrow">¶</a></p>
<section id="section-7.1">
        <h3 id="name-rfc-4585-rtp-avpf-2">
<a href="#section-7.1" class="section-number selfRef">7.1. </a><a href="#name-rfc-4585-rtp-avpf-2" class="section-name selfRef">RFC 4585: RTP/AVPF</a>
        </h3>
<p id="section-7.1-1"><span>[<a href="#RFC4585" class="xref">RFC4585</a>]</span> defines an extension to
        the Audio-Visual Profile (AVP) that enables receivers to
        provide, statistically, more immediate feedback to the
        senders; it thus allows for short-term adaptation and implementation of
        efficient feedback-based repair mechanisms.<a href="#section-7.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4585-attribute-analysis-2"></span><table class="center" id="table-60">
          <caption>
<a href="#table-60" class="selfRef">Table 60</a>:
<a href="#name-rfc-4585-attribute-analysis-2" class="selfRef">RFC 4585 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ack rpsi</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ack app</td>
              <td class="text-left" rowspan="1" colspan="1">Feedback parameters <span class="bcp14">MUST</span> be handled in the app-specific
         way when multiplexed.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack pli</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack sli</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack rpsi</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack app</td>
              <td class="text-left" rowspan="1" colspan="1">Feedback parameters <span class="bcp14">MUST</span> be handled in the app specific
         way when multiplexed.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">trr-int</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-7.2">
        <h3 id="name-rfc-5104-codec-control-mess">
<a href="#section-7.2" class="section-number selfRef">7.2. </a><a href="#name-rfc-5104-codec-control-mess" class="section-name selfRef">RFC 5104: Codec Control Messages in AVPF</a>
        </h3>
<p id="section-7.2-1"><span>[<a href="#RFC5104" class="xref">RFC5104</a>]</span> specifies a few
        extensions to the messages defined in the Audio-Visual
        Profile with Feedback (AVPF). They are helpful primarily in
        conversational multimedia scenarios where centralized
        multipoint functionalities are in use. However, some are
        also usable in smaller multicast environments and
        point-to-point calls.<a href="#section-7.2-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5104-attribute-analysis"></span><table class="center" id="table-61">
          <caption>
<a href="#table-61" class="selfRef">Table 61</a>:
<a href="#name-rfc-5104-attribute-analysis" class="selfRef">RFC 5104 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccm</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
        for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-7.3">
        <h3 id="name-rfc-6285-unicast-based-rapi">
<a href="#section-7.3" class="section-number selfRef">7.3. </a><a href="#name-rfc-6285-unicast-based-rapi" class="section-name selfRef">RFC 6285: Unicast-Based Rapid Acquisition of Multicast        RTP Sessions (RAMS)</a>
        </h3>
<p id="section-7.3-1"><span>[<a href="#RFC6285" class="xref">RFC6285</a>]</span> describes a method of
        using the existing RTP and RTCP
        machinery that reduces the acquisition delay. In this
        method, an auxiliary unicast RTP session carrying the
        Reference Information to the receiver precedes or
        accompanies the multicast stream. This unicast RTP flow can
        be transmitted at a faster-than-natural bitrate to further
        accelerate the acquisition. The motivating use case for
        this capability is multicast applications that carry
        real-time compressed audio and video.<a href="#section-7.3-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6285-attribute-analysis-2"></span><table class="center" id="table-62">
          <caption>
<a href="#table-62" class="selfRef">Table 62</a>:
<a href="#name-rfc-6285-attribute-analysis-2" class="selfRef">RFC 6285 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack rai</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-7.4">
        <h3 id="name-rfc-6679-ecn-for-rtp-over-u">
<a href="#section-7.4" class="section-number selfRef">7.4. </a><a href="#name-rfc-6679-ecn-for-rtp-over-u" class="section-name selfRef">RFC 6679: ECN for RTP over UDP/IP</a>
        </h3>
<p id="section-7.4-1"><span>[<a href="#RFC6679" class="xref">RFC6679</a>]</span> specifies how Explicit
        Congestion Notification (ECN) can be used with the RTP running
        over UDP, using the RTCP as a feedback mechanism. It defines
        a new RTCP Extended Report (XR) block for periodic ECN
        feedback, a new RTCP transport feedback message for timely
        reporting of congestion events, and a STUN extension used in the optional
        initialization method using ICE.<a href="#section-7.4-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6679-attribute-analysis"></span><table class="center" id="table-63">
          <caption>
<a href="#table-63" class="selfRef">Table 63</a>:
<a href="#name-rfc-6679-attribute-analysis" class="selfRef">RFC 6679 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ecn-capable-rtp</td>
              <td class="text-left" rowspan="1" colspan="1">ECN markup is enabled at the
         RTP session level.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack ecn</td>
              <td class="text-left" rowspan="1" colspan="1">This attribute enables ECN at the RTP
         session level.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-7.5">
        <h3 id="name-rfc-6642-third-party-loss-r">
<a href="#section-7.5" class="section-number selfRef">7.5. </a><a href="#name-rfc-6642-third-party-loss-r" class="section-name selfRef">RFC 6642: Third-Party Loss Report</a>
        </h3>
<p id="section-7.5-1">In a large RTP session using the RTCP
        feedback mechanism defined in <span>[<a href="#RFC4585" class="xref">RFC4585</a>]</span>,
        a feedback target may experience transient overload if some event
        causes a large number of receivers to send feedback at once.
        This overload is usually avoided by ensuring that feedback
        reports are forwarded to all receivers, allowing them to avoid
        sending duplicate feedback reports. However, there are cases where
        it is not recommended to forward feedback reports, and this may allow
        feedback implosion. <span>[<a href="#RFC6642" class="xref">RFC6642</a>]</span> discusses these
 cases and defines a new RTCP Third-Party
        Loss Report that can be used to inform receivers that the
        feedback target is aware of some loss event, allowing them to
        suppress feedback. Associated SDP signaling is also defined.<a href="#section-7.5-1" class="pilcrow">¶</a></p>
<span id="name-rfc-6642-attribute-analysis"></span><table class="center" id="table-64">
          <caption>
<a href="#table-64" class="selfRef">Table 64</a>:
<a href="#name-rfc-6642-attribute-analysis" class="selfRef">RFC 6642 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack tllei</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nack pslei</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-7.6">
        <h3 id="name-rfc-5104-codec-control-messa">
<a href="#section-7.6" class="section-number selfRef">7.6. </a><a href="#name-rfc-5104-codec-control-messa" class="section-name selfRef">RFC 5104: Codec Control Messages in AVPF</a>
        </h3>
<p id="section-7.6-1"><span>[<a href="#RFC5104" class="xref">RFC5104</a>]</span> specifies a few
        extensions to the messages defined in the Audio-Visual
        Profile with Feedback (AVPF). They are helpful primarily in
        conversational multimedia scenarios where centralized
        multipoint functionalities are in use. However, some are
        also usable in smaller multicast environments and
        point-to-point calls.<a href="#section-7.6-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5104-attribute-analysis-2"></span><table class="center" id="table-65">
          <caption>
<a href="#table-65" class="selfRef">Table 65</a>:
<a href="#name-rfc-5104-attribute-analysis-2" class="selfRef">RFC 5104 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccm fir</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccm tmmbr</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccm tstr</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ccm vbcm</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="SecgroupAnalysis">
<section id="section-8">
      <h2 id="name-group-attribute-analysis">
<a href="#section-8" class="section-number selfRef">8. </a><a href="#name-group-attribute-analysis" class="section-name selfRef">group Attribute Analysis</a>
      </h2>
<p id="section-8-1">
       This section analyzes SDP "group" attribute semantics
       <span>[<a href="#RFC5888" class="xref">RFC5888</a>]</span>.<a href="#section-8-1" class="pilcrow">¶</a></p>
<section id="section-8.1">
        <h3 id="name-rfc-5888-sdp-grouping-frame">
<a href="#section-8.1" class="section-number selfRef">8.1. </a><a href="#name-rfc-5888-sdp-grouping-frame" class="section-name selfRef">RFC 5888: SDP Grouping Framework</a>
        </h3>
<p id="section-8.1-1">
         <span>[<a href="#RFC5888" class="xref">RFC5888</a>]</span> defines a framework
         to group "m=" lines in SDP for different purposes.<a href="#section-8.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5888-attribute-analysis"></span><table class="center" id="table-66">
          <caption>
<a href="#table-66" class="selfRef">Table 66</a>:
<a href="#name-rfc-5888-attribute-analysis" class="selfRef">RFC 5888 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:LS</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:FID</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-8.2">
        <h3 id="name-rfc-3524-mapping-media-stre">
<a href="#section-8.2" class="section-number selfRef">8.2. </a><a href="#name-rfc-3524-mapping-media-stre" class="section-name selfRef">RFC 3524: Mapping Media Streams to Resource Reservation Flows</a>
        </h3>
<p id="section-8.2-1"><span>[<a href="#RFC3524" class="xref">RFC3524</a>]</span> defines an extension to
        the SDP grouping framework. It allows requesting a group of media
        streams to be mapped into a single resource reservation flow. The SDP syntax
        needed is defined, as well as a new "semantics" attribute
        called Single Reservation Flow (SRF).<a href="#section-8.2-1" class="pilcrow">¶</a></p>
<span id="name-rfc-3524-attribute-analysis"></span><table class="center" id="table-67">
          <caption>
<a href="#table-67" class="selfRef">Table 67</a>:
<a href="#name-rfc-3524-attribute-analysis" class="selfRef">RFC 3524 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:SRF</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-8.3">
        <h3 id="name-rfc-4091-anat-semantics">
<a href="#section-8.3" class="section-number selfRef">8.3. </a><a href="#name-rfc-4091-anat-semantics" class="section-name selfRef">RFC 4091: ANAT Semantics</a>
        </h3>
<p id="section-8.3-1">
         <span>[<a href="#RFC4091" class="xref">RFC4091</a>]</span> defines ANAT semantics for the
         SDP grouping framework. (Note: <span>[<a href="#RFC4091" class="xref">RFC4091</a>]</span> has been
  obsoleted by <span>[<a href="#RFC8445" class="xref">RFC8445</a>]</span>.) The ANAT semantics allow alternative
         types of network addresses to establish a particular media stream.<a href="#section-8.3-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4091-attribute-analysis"></span><table class="center" id="table-68">
          <caption>
<a href="#table-68" class="selfRef">Table 68</a>:
<a href="#name-rfc-4091-attribute-analysis" class="selfRef">RFC 4091 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:ANAT</td>
              <td class="text-left" rowspan="1" colspan="1">ANAT semantics is obsoleted.</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-8.4">
        <h3 id="name-rfc-5956-fec-grouping-seman">
<a href="#section-8.4" class="section-number selfRef">8.4. </a><a href="#name-rfc-5956-fec-grouping-seman" class="section-name selfRef">RFC 5956: FEC Grouping Semantics in SDP</a>
        </h3>
<p id="section-8.4-1"><span>[<a href="#RFC5956" class="xref">RFC5956</a>]</span> defines the semantics
        for grouping the associated source and FEC-based repair flows in
 SDP. The semantics defined in the document are to be used with the SDP
 Grouping Framework
        <span>[<a href="#RFC5888" class="xref">RFC5888</a>]</span>. These
        semantics allow the description of grouping relationships
        between the source and repair flows when one or more source
        and/or repair flows are associated in the same group; they also
 provide support for additive repair flows. SSRC-level
        grouping semantics are also defined
        in this document for RTP streams using SSRC multiplexing.<a href="#section-8.4-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5956-attribute-analysis"></span><table class="center" id="table-69">
          <caption>
<a href="#table-69" class="selfRef">Table 69</a>:
<a href="#name-rfc-5956-attribute-analysis" class="selfRef">RFC 5956 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:FEC-FR</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-8.5">
        <h3 id="name-rfc-5583-signaling-media-de">
<a href="#section-8.5" class="section-number selfRef">8.5. </a><a href="#name-rfc-5583-signaling-media-de" class="section-name selfRef">RFC 5583: Signaling Media Decoding Dependency in SDP</a>
        </h3>
<p id="section-8.5-1"><span>[<a href="#RFC5583" class="xref">RFC5583</a>]</span> defines semantics that
        allow for signaling the decoding dependency of different
        media descriptions with the same media type in SDP. This is
        required, for example, if media data is separated and transported
        in different network streams as a result of using a layered or
        multiple descriptive media coding process.<a href="#section-8.5-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5583-attribute-analysis"></span><table class="center" id="table-70">
          <caption>
<a href="#table-70" class="selfRef">Table 70</a>:
<a href="#name-rfc-5583-attribute-analysis" class="selfRef">RFC 5583 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:DDP</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">depend lay</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">depend mdc</td>
              <td class="text-left" rowspan="1" colspan="1">The attribute value <span class="bcp14">MUST</span> be the same
         for a given codec configuration.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-8.6">
        <h3 id="name-rfc-7104-duplication-groupi">
<a href="#section-8.6" class="section-number selfRef">8.6. </a><a href="#name-rfc-7104-duplication-groupi" class="section-name selfRef">RFC 7104: Duplication Grouping Semantics in the SDP</a>
        </h3>
<p id="section-8.6-1"><span>[<a href="#RFC7104" class="xref">RFC7104</a>]</span> defines the semantics for
    grouping redundant streams in SDP. The semantics defined in this
    document are to be used with the SDP Grouping Framework. Grouping
    semantics at the synchronization source (SSRC) level are also
 defined in this document for RTP
    streams using SSRC multiplexing.<a href="#section-8.6-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7104-attribute-analysis"></span><table class="center" id="table-71">
          <caption>
<a href="#table-71" class="selfRef">Table 71</a>:
<a href="#name-rfc-7104-attribute-analysis" class="selfRef">RFC 7104 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">group:DUP</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="sec-ssrc-group">
<section id="section-9">
      <h2 id="name-ssrc-group-attribute-analys">
<a href="#section-9" class="section-number selfRef">9. </a><a href="#name-ssrc-group-attribute-analys" class="section-name selfRef">ssrc-group Attribute Analysis</a>
      </h2>
<p id="section-9-1">
     This section analyzes "ssrc-group" semantics.<a href="#section-9-1" class="pilcrow">¶</a></p>
<section id="section-9.1">
        <h3 id="name-rfc-5576-source-specific-sdp">
<a href="#section-9.1" class="section-number selfRef">9.1. </a><a href="#name-rfc-5576-source-specific-sdp" class="section-name selfRef">RFC 5576: Source-Specific SDP Attributes</a>
        </h3>
<p id="section-9.1-1"><span>[<a href="#RFC5576" class="xref">RFC5576</a>]</span> defines a mechanism for
        describing RTP media sources -- which are identified by their
        synchronization source (SSRC) identifiers -- in SDP, to
        associate attributes with these sources and express
        relationships among sources. It also defines several
        source-level attributes that can be used to describe
        properties of media sources.<a href="#section-9.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5576-attribute-analysis-2"></span><table class="center" id="table-72">
          <caption>
<a href="#table-72" class="selfRef">Table 72</a>:
<a href="#name-rfc-5576-attribute-analysis-2" class="selfRef">RFC 5576 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ssrc-group:FID</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ssrc-group:FEC</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ssrc-group:FEC-FR</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-9.2">
        <h3 id="name-rfc-7104-duplication-groupin">
<a href="#section-9.2" class="section-number selfRef">9.2. </a><a href="#name-rfc-7104-duplication-groupin" class="section-name selfRef">RFC 7104: Duplication Grouping Semantics in the SDP</a>
        </h3>
<p id="section-9.2-1"><span>[<a href="#RFC7104" class="xref">RFC7104</a>]</span> defines the semantics for
        grouping redundant streams in SDP.
        The semantics defined in this document are to be used with the SDP
        Grouping Framework. Grouping semantics at the synchronization source
        (SSRC) level are also defined in this document for RTP streams using
        SSRC multiplexing.<a href="#section-9.2-1" class="pilcrow">¶</a></p>
<span id="name-rfc-7104-attribute-analysis-2"></span><table class="center" id="table-73">
          <caption>
<a href="#table-73" class="selfRef">Table 73</a>:
<a href="#name-rfc-7104-attribute-analysis-2" class="selfRef">RFC 7104 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">ssrc-group:DUP</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">SR</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="SecqostokenAnalysis">
<section id="section-10">
      <h2 id="name-qos-mechanism-token-analysi">
<a href="#section-10" class="section-number selfRef">10. </a><a href="#name-qos-mechanism-token-analysi" class="section-name selfRef">QoS Mechanism Token Analysis</a>
      </h2>
<p id="section-10-1">
        This section analyzes QoS tokes specified with SDP.<a href="#section-10-1" class="pilcrow">¶</a></p>
<section id="section-10.1">
        <h3 id="name-rfc-5432-qos-mechanism-selec">
<a href="#section-10.1" class="section-number selfRef">10.1. </a><a href="#name-rfc-5432-qos-mechanism-selec" class="section-name selfRef">RFC 5432: QoS Mechanism Selection in SDP</a>
        </h3>
<p id="section-10.1-1"><span>[<a href="#RFC5432" class="xref">RFC5432</a>]</span> defines procedures to
        negotiate QoS mechanisms using the SDP offer/answer model.<a href="#section-10.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5432-attribute-analysis-2"></span><table class="center" id="table-74">
          <caption>
<a href="#table-74" class="selfRef">Table 74</a>:
<a href="#name-rfc-5432-attribute-analysis-2" class="selfRef">RFC 5432 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">rsvp</td>
              <td class="text-left" rowspan="1" colspan="1">rsvp attribute <span class="bcp14">MUST</span> be the one
          that corresponds to the "m=" line chosen for
          setting up the underlying transport flow.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">nsis</td>
              <td class="text-left" rowspan="1" colspan="1">rsvp attribute <span class="bcp14">MUST</span> be the one
          that corresponds to the "m=" line chosen for
          setting up the underlying transport.</td>
              <td class="text-left" rowspan="1" colspan="1">B</td>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
            </tr>
          </tbody>
        </table>
<p id="section-10.1-3">NOTE: A single Differentiated Services Code Point (DSCP) for each
        flow being multiplexed doesn't impact multiplexing, since QoS
        mechanisms are signaled/scoped per flow. For scenarios that involve
        having different DSCP code points for packets being transmitted over
        the same 5-tuple, issues as discussed in <span>[<a href="#RFC7657" class="xref">RFC7657</a>]</span> need to be taken into consideration.<a href="#section-10.1-3" class="pilcrow">¶</a></p>
</section>
</section>
</div>
<div id="SeckAnalysis">
<section id="section-11">
      <h2 id="name-k-attribute-analysis">
<a href="#section-11" class="section-number selfRef">11. </a><a href="#name-k-attribute-analysis" class="section-name selfRef">k= Attribute Analysis</a>
      </h2>
<section id="section-11.1">
        <h3 id="name-rfc-4566-sdp-3">
<a href="#section-11.1" class="section-number selfRef">11.1. </a><a href="#name-rfc-4566-sdp-3" class="section-name selfRef">RFC 4566: SDP</a>
        </h3>
<p id="section-11.1-1"><span>[<a href="#RFC4566" class="xref">RFC4566</a>]</span> defines SDP that is intended for describing
        multimedia sessions for the purposes of session announcement,
        session invitation, and other forms of multimedia session
        initiation.<a href="#section-11.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4566-attribute-analysis-2"></span><table class="center" id="table-75">
          <caption>
<a href="#table-75" class="selfRef">Table 75</a>:
<a href="#name-rfc-4566-attribute-analysis-2" class="selfRef">RFC 4566 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">k=</td>
              <td class="text-left" rowspan="1" colspan="1">It is not recommended to use this attribute under multiplexing.</td>
              <td class="text-left" rowspan="1" colspan="1">S</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="SeccontentAnalysis">
<section id="section-12">
      <h2 id="name-content-attribute-analysis">
<a href="#section-12" class="section-number selfRef">12. </a><a href="#name-content-attribute-analysis" class="section-name selfRef">content Attribute Analysis</a>
      </h2>
<section id="section-12.1">
        <h3 id="name-rfc-4796">
<a href="#section-12.1" class="section-number selfRef">12.1. </a><a href="#name-rfc-4796" class="section-name selfRef">RFC 4796</a>
        </h3>
<p id="section-12.1-1"><span>[<a href="#RFC4796" class="xref">RFC4796</a>]</span> defines a new SDP media-level attribute,
        "content". The "content" attribute defines the content of the media
        stream to a more detailed level than the media description
        line. The sender of an SDP session description can attach
        the "content" attribute to one or more media streams. The
        receiving application can then treat each media stream
        differently (e.g., show it on a big or small screen) based
        on its content.<a href="#section-12.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-4796-attribute-analysis-2"></span><table class="center" id="table-76">
          <caption>
<a href="#table-76" class="selfRef">Table 76</a>:
<a href="#name-rfc-4796-attribute-analysis-2" class="selfRef">RFC 4796 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">content:slides</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">content:speaker</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">content:main</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">content:sl</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">content:alt</td>
              <td class="text-left" rowspan="1" colspan="1">Not impacted</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-12.2">
        <h3 id="name-3gpp-ts-24182">
<a href="#section-12.2" class="section-number selfRef">12.2. </a><a href="#name-3gpp-ts-24182" class="section-name selfRef">3GPP TS 24.182</a>
        </h3>
<p id="section-12.2-1">
          <span>[<a href="#IMS-CAT" class="xref">IMS-CAT</a>]</span> specifies an IP multimedia subsystem for
          customized alerting tones.<a href="#section-12.2-1" class="pilcrow">¶</a></p>
<span id="name-3gpp-ts-24182-attribute-ana"></span><table class="center" id="table-77">
          <caption>
<a href="#table-77" class="selfRef">Table 77</a>:
<a href="#name-3gpp-ts-24182-attribute-ana" class="selfRef">3GPP TS 24.182 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">g.3gpp.cat</td>
              <td class="text-left" rowspan="1" colspan="1">Usage defined for the IP multimedia subsystem</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
<section id="section-12.3">
        <h3 id="name-3gpp-ts-24183">
<a href="#section-12.3" class="section-number selfRef">12.3. </a><a href="#name-3gpp-ts-24183" class="section-name selfRef">3GPP TS 24.183</a>
        </h3>
<p id="section-12.3-1">
          <span>[<a href="#IMS-CRS" class="xref">IMS-CRS</a>]</span> specifies an IP multimedia
          subsystem for customized ringing signal.<a href="#section-12.3-1" class="pilcrow">¶</a></p>
<span id="name-3gpp-ts-24183-attribute-ana"></span><table class="center" id="table-78">
          <caption>
<a href="#table-78" class="selfRef">Table 78</a>:
<a href="#name-3gpp-ts-24183-attribute-ana" class="selfRef">3GPP TS 24.183 Attribute Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">g.3gpp.crs</td>
              <td class="text-left" rowspan="1" colspan="1">Usage defined for the IP multimedia subsystem</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="sec-pay">
<section id="section-13">
      <h2 id="name-payload-formats">
<a href="#section-13" class="section-number selfRef">13. </a><a href="#name-payload-formats" class="section-name selfRef">Payload Formats</a>
      </h2>
<section id="section-13.1">
        <h3 id="name-rfc-5109-rtp-payload-format">
<a href="#section-13.1" class="section-number selfRef">13.1. </a><a href="#name-rfc-5109-rtp-payload-format" class="section-name selfRef">RFC 5109: RTP Payload Format for Generic FEC</a>
        </h3>
<p id="section-13.1-1"><span>[<a href="#RFC5109" class="xref">RFC5109</a>]</span> describes a payload
        format for generic Forward Error Correction (FEC) for media
        data encapsulated in RTP. It is based on the exclusive-or
        (parity) operation. The payload format allows end systems
        to apply protection using various protection lengths and
        levels, in addition to using various protection group sizes
        to adapt to different media and channel characteristics. It
        enables complete recovery of the protected packets or
        partial recovery of the critical parts of the payload,
        depending on the packet loss situation.<a href="#section-13.1-1" class="pilcrow">¶</a></p>
<span id="name-rfc-5109-payload-format-ana"></span><table class="center" id="table-79">
          <caption>
<a href="#table-79" class="selfRef">Table 79</a>:
<a href="#name-rfc-5109-payload-format-ana" class="selfRef">RFC 5109 Payload Format Analysis</a>
          </caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Name</th>
              <th class="text-left" rowspan="1" colspan="1">Notes</th>
              <th class="text-left" rowspan="1" colspan="1">Level</th>
              <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">audio/ulpfec</td>
              <td class="text-left" rowspan="1" colspan="1">Not recommended for multiplexing due to reuse of SSRCs.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">video/ulpfec</td>
              <td class="text-left" rowspan="1" colspan="1">Not recommended for multiplexing due to reuse of SSRCs.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">text/ulpfec</td>
              <td class="text-left" rowspan="1" colspan="1">Not recommended for multiplexing due to reuse of SSRCs.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">application/ulpfec</td>
              <td class="text-left" rowspan="1" colspan="1">Not recommended for multiplexing due to reuse of SSRCs.</td>
              <td class="text-left" rowspan="1" colspan="1">M</td>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
            </tr>
          </tbody>
        </table>
</section>
</section>
</div>
<div id="sec-encap">
<section id="section-14">
      <h2 id="name-multiplexing-considerations">
<a href="#section-14" class="section-number selfRef">14. </a><a href="#name-multiplexing-considerations" class="section-name selfRef">Multiplexing Considerations for Encapsulating Attributes</a>
      </h2>
<p id="section-14-1">This section deals with recommendations for defining the
           multiplexing characteristics of the SDP attributes that
           encapsulate other SDP attributes/parameters. As of today, such
           attributes, for example, are defined in
           <span>[<a href="#RFC3407" class="xref">RFC3407</a>]</span>, <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> and
           <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> as part of a generic
           framework for indicating and negotiating transport-, media-,
           and media-format-related capabilities in the SDP.<a href="#section-14-1" class="pilcrow">¶</a></p>
<p id="section-14-2">The behavior of such attributes under multiplexing is, in
           turn, defined by the multiplexing behavior of the attributes
           they encapsulate, which are made known once the offer/answer
           negotiation process is completed.<a href="#section-14-2" class="pilcrow">¶</a></p>
<section id="section-14.1">
        <h3 id="name-rfc-3407-cpar-attribute-ana">
<a href="#section-14.1" class="section-number selfRef">14.1. </a><a href="#name-rfc-3407-cpar-attribute-ana" class="section-name selfRef">RFC 3407: cpar Attribute Analysis</a>
        </h3>
<p id="section-14.1-1">The <span>[<a href="#RFC3407" class="xref">RFC3407</a>]</span> capability parameter
             attribute "a=cpar" encapsulates a "b=" (bandwidth) or an
             "a=" attribute. For bandwidth attribute encapsulation,
             the category SUM is inherited. For the case of "a=" attribute,
             the category corresponding to the SDP attribute being
             encapsulated is inherited.<a href="#section-14.1-1" class="pilcrow">¶</a></p>
<div id="section-14.1-2">
<pre class="sourcecode lang-sdp">
 v=0
 o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
 s=
 c=IN IP4 host.atlanta.example.com
 t=0 0
 m=video 3456 RTP/AVP 100
 a=rtpmap:100 VP8/90000
 a=sqn: 0
 a=cdsc: 1 video RTP/AVP 100
 a=cpar: a=rtcp-mux
 m=video 3456 RTP/AVP 101
 a=rtpmap:101 VP8/90000
 a=fmtp:100 max-fr=15;max-fs=1200
 a=cdsc: 2 video RTP/AVP 101
 a=cpar: a=rtcp-mux</pre><a href="#section-14.1-2" class="pilcrow">¶</a>
</div>
<p id="section-14.1-3">In this example, the category IDENTICAL is
             inherited for the cpar-encapsulated "rtcp-mux"
             attribute.<a href="#section-14.1-3" class="pilcrow">¶</a></p>
<p id="section-14.1-4"></p>
</section>
<section id="section-14.2">
        <h3 id="name-rfc-5939-analysis">
<a href="#section-14.2" class="section-number selfRef">14.2. </a><a href="#name-rfc-5939-analysis" class="section-name selfRef">RFC 5939 Analysis</a>
        </h3>
<p id="section-14.2-1"><span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> defines a general SDP
              capability negotiation framework. It also specifies
              how to provide transport protocols and SDP attributes
              as capabilities and negotiate them using the
              framework.<a href="#section-14.2-1" class="pilcrow">¶</a></p>
<p id="section-14.2-2">For this purpose, <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> defines the following:<a href="#section-14.2-2" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-14.2-3.1">A set of capabilities for the session and its
                    associated media-stream components, supported
                    by each side. The attribute "a=acap" defines
                    how to list an attribute name and its
                    associated value (if any) as a capability. The
                    attribute "a=tcap" defines how to list
                    transport protocols (e.g., "RTP/AVP") as
                    capabilities.<a href="#section-14.2-3.1" class="pilcrow">¶</a>
</li>
          <li class="normal" id="section-14.2-3.2">A set of potential configurations ("a=pcfg") provided
                    by the offerer to indicate which combinations of those
                    capabilities can be used for the session and its
                    associated media stream components. Potential
                    configurations are not ready for use until fully
                    negotiated. They provide an alternative that <span class="bcp14">MAY</span>
                    be used, subject to SDP capability-negotiation
                    procedures. In particular, the answerer <span class="bcp14">MAY</span> choose
                    one of the potential configurations for use as part
                    of the current offer/answer exchange.<a href="#section-14.2-3.2" class="pilcrow">¶</a>
</li>
          <li class="normal" id="section-14.2-3.3">An actual configuration ("a=acfg") for the session
                    and its associated media stream components. The
                    actual configuration identifies the potential
                    configuration that was negotiated for use. Use
                    of an actual configuration does not require
                    any further negotiation.<a href="#section-14.2-3.3" class="pilcrow">¶</a>
</li>
          <li class="normal" id="section-14.2-3.4">A negotiation process that takes the current
                    actual and the set of potential configurations
                    (combinations of capabilities) as input and
                    provides the negotiated actual configurations
                    as output. In <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span>, the
                    negotiation process is done independently for
                    each media description.<a href="#section-14.2-3.4" class="pilcrow">¶</a>
</li>
        </ul>
<div id="sec-cap-neg-proc">
<section id="section-14.2.1">
          <h4 id="name-recommendation-procedures-f">
<a href="#section-14.2.1" class="section-number selfRef">14.2.1. </a><a href="#name-recommendation-procedures-f" class="section-name selfRef">Recommendation: Procedures for Potential Configuration Pairing</a>
          </h4>
<p id="section-14.2.1-1">This section provides recommendations for entities
                generating and processing SDP under the generic
                capability-negotiation framework as defined in
                <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> under the context of media-stream
 multiplexing.<a href="#section-14.2.1-1" class="pilcrow">¶</a></p>
<p id="section-14.2.1-2">These recommendations are provided for the purposes
                of enabling the offerer to make sure that the
                generated potential configurations between the
                multiplexed streams can (easily) be negotiated to be
                consistent between those streams. In particular, the
                procedures aim to simplify the answerer's procedure for choosing
                potential configurations that are consistent across
                all the multiplexed media descriptions.<a href="#section-14.2.1-2" class="pilcrow">¶</a></p>
<p id="section-14.2.1-3">A potential configuration selects a set of attributes
                and parameters that become part of the media description
                when negotiated. When multiplexing media descriptions with
                potential configurations specified, there <span class="bcp14">MAY</span> be a need
                for coordinating this selection between multiplexed media
                descriptions to ensure the right multiplexing behavior.<a href="#section-14.2.1-3" class="pilcrow">¶</a></p>
<p id="section-14.2.1-4">Although it is possible to analyze the various potential
                configurations in multiplexed media descriptions to find combinations
                that satisfy such constraints, it can quickly become complicated
                to do so.<a href="#section-14.2.1-4" class="pilcrow">¶</a></p>
<p id="section-14.2.1-5">The procedures defined in <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> state
                that each potential configuration in the SDP has a unique
                configuration number; however, the scope of uniqueness is
                limited to each media description. To make it simple for the
                answerer to chose valid combinations of potential configurations
                across media descriptions in a given BUNDLE group, we provide a
                simple rule for constructing potential configurations:<a href="#section-14.2.1-5" class="pilcrow">¶</a></p>
<ul class="normal">
<li class="normal" id="section-14.2.1-6.1">Let m-bundle be the set of media descriptions that form
                    a given bundle.<a href="#section-14.2.1-6.1" class="pilcrow">¶</a>
</li>
            <li class="normal" id="section-14.2.1-6.2">Let m-bundle-pcfg be the set of media descriptions in
                    m-bundle that include one or more potential configurations.<a href="#section-14.2.1-6.2" class="pilcrow">¶</a>
</li>
            <li class="normal" id="section-14.2.1-6.3">Each media description in m-bundle-pcfg <span class="bcp14">MUST</span> have at
                    least one potential configuration with the same configuration
                    number (e.g., "1").<a href="#section-14.2.1-6.3" class="pilcrow">¶</a>
</li>
            <li class="normal" id="section-14.2.1-6.4">For each potential configuration with configuration number x
                    in m-bundle-pcfg, the offerer <span class="bcp14">MUST</span> ensure that if the answerer
                    chooses configuration number x in each of the media descriptions
                    in m-bundle-pcfg, then the resulting SDP will have all multiplexing
                    constraints satisfied for those media descriptions.<a href="#section-14.2.1-6.4" class="pilcrow">¶</a>
</li>
            <li class="normal" id="section-14.2.1-6.5">Since it is nearly impossible to define a generic
                    mechanism for various capability extensions, this
                    document doesn't provide procedures for dealing
                    with the capability-extension attributes. However,
                    <a href="#med-cap-analysis" class="xref">Section 14.3</a> provides
                    analysis of media-capability-extension attributes
                    as defined in <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span>.<a href="#section-14.2.1-6.5" class="pilcrow">¶</a>
</li>
          </ul>
<p id="section-14.2.1-7">The above allows the answerer to easily find multiplexing-compatible
                  combinations of potential configurations. The answerer simply chooses a
                  potential configuration (number) that is present in all of the media
                  descriptions with potential configurations in the bundle.<a href="#section-14.2.1-7" class="pilcrow">¶</a></p>
<p id="section-14.2.1-8">Note that it is still possible for the offerer to provide additional
                  potential configurations with independent configuration numbers. The
                  answerer will have to perform more complicated analysis to determine
                  valid multiplexed combinations of those.<a href="#section-14.2.1-8" class="pilcrow">¶</a></p>
<section id="section-14.2.1.1">
            <h5 id="name-example-transport-capabilit">
<a href="#section-14.2.1.1" class="section-number selfRef">14.2.1.1. </a><a href="#name-example-transport-capabilit" class="section-name selfRef">Example: Transport-Capability Multiplexing</a>
            </h5>
<div id="section-14.2.1.1-1">
<pre class="sourcecode lang-sdp">
v=0
o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
s=
c=IN IP4 host.atlanta.example.com
t=0 0
a=tcap:1 RTP/SAVPF
a=tcap:2 RTP/SAVP
a=group:BUNDLE audio video
m=audio
a=mid:audio
a=pcfg:1 t=1
a=pcfg:2
m=video
a=mid:video
a=pcfg:1 t=1
a=pcfg:2 t=2
</pre><a href="#section-14.2.1.1-1" class="pilcrow">¶</a>
</div>
<p id="section-14.2.1.1-2">In this example, the potential configurations that offer
            transport-protocol capability of RTP/SAVPF have the same configuration
            number "1" in both the audio and video media descriptions.<a href="#section-14.2.1.1-2" class="pilcrow">¶</a></p>
</section>
<section id="section-14.2.1.2">
            <h5 id="name-example-attribute-capabilit">
<a href="#section-14.2.1.2" class="section-number selfRef">14.2.1.2. </a><a href="#name-example-attribute-capabilit" class="section-name selfRef">Example: Attribute-Capability Multiplexing</a>
            </h5>
<div id="section-14.2.1.2-1">
<pre class="sourcecode lang-sdp">
v=0
o=alice 2890844526 2890844527 IN IP4 host.atlanta.example.com
s=
c=IN IP4 host.atlanta.example.com
t=0 0
a=acap:1 a=rtcp-mux
a=acap:2 a=crypto:1 AES_CM_128_HMAC_SHA1_80
  inline:EcGZiNWpFJhQXdspcl1ekcmVCNWpVLcfHAwJSoj|2^20|1:32
a=group:BUNDLE audio video
m=audio 49172 RTP/AVP 99
a=mid:audio
a=pcfg:1 a=1
a=pcfg:2
m=video 560024 RTP/AVP 100
a=mid:video
a=pcfg:1 a=1
a=pcfg:2 a=2
</pre><a href="#section-14.2.1.2-1" class="pilcrow">¶</a>
</div>
<p id="section-14.2.1.2-2">In this example, the potential configuration number "1" is
            repeated while referring to attribute capability a=rtcp-mux, since
            the behavior is IDENTICAL for the attribute a=rtcp-mux under
            multiplexing.<a href="#section-14.2.1.2-2" class="pilcrow">¶</a></p>
</section>
</section>
</div>
</section>
<div id="med-cap-analysis">
<section id="section-14.3">
        <h3 id="name-rfc-6871-analysis">
<a href="#section-14.3" class="section-number selfRef">14.3. </a><a href="#name-rfc-6871-analysis" class="section-name selfRef">RFC 6871 Analysis</a>
        </h3>
<p id="section-14.3-1"><span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> extends the capability negotiation
        framework described in <span>[<a href="#RFC5939" class="xref">RFC5939</a>]</span> by
        defining media capabilities that can be used to indicate
        and negotiate media types and their associated format
        parameters. It also allows indication of latent configurations
        and session capabilities.<a href="#section-14.3-1" class="pilcrow">¶</a></p>
<section id="section-14.3.1">
          <h4 id="name-recommendation-dealing-with">
<a href="#section-14.3.1" class="section-number selfRef">14.3.1. </a><a href="#name-recommendation-dealing-with" class="section-name selfRef">Recommendation: Dealing with Payload Type Numbers</a>
          </h4>
<p id="section-14.3.1-1"><span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> defines a new payload type parameter ("pt")
          to be used with the potential, actual, and latent configuration parameters.
          The parameter associates RTP payload type numbers with the
          referenced RTP-based media-format capabilities ("a=rmcap") defined
          in <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> and is appropriate only when the
   transport protocol
          uses RTP. This means that the same payload type number can be
          assigned as part of potential or actual configurations in different
          media descriptions in a bundle. There are rules for the usage of
          identical payload type values across multiplexed "m=" lines,
          described in <span>[<a href="#RFC8843" class="xref">RFC8843</a>]</span>,
          which must be followed here, as well. As described in
          <a href="#sec-cap-neg-proc" class="xref">Section 14.2.1</a>, the use of identical
          configuration numbers for compatible configurations in
          different media descriptions that are part of the bundle provides
          a way to ensure that the answerer can easily pick compatible
          configurations here, as well.<a href="#section-14.3.1-1" class="pilcrow">¶</a></p>
<section id="section-14.3.1.1">
            <h5 id="name-example-attribute-capability">
<a href="#section-14.3.1.1" class="section-number selfRef">14.3.1.1. </a><a href="#name-example-attribute-capability" class="section-name selfRef">Example: Attribute Capability under Shared Payload Type</a>
            </h5>
<p id="section-14.3.1.1-1">The attributes "a=rmcap" and "a=mfcap" follow the above
            recommendations under multiplexing.<a href="#section-14.3.1.1-1" class="pilcrow">¶</a></p>
<div id="section-14.3.1.1-2">
<pre class="sourcecode lang-sdp">
v=0
o=- 25678 753849 IN IP4 192.0.2.1
s=
c=IN IP4 192.0.2.1
t=0 0
a=creq:med-v0
m=audio 54322 RTP/AVP 96
a=rtpmap:96 AMR-WB/16000/1
a=fmtp:96 mode-change-capability=1; max-red=220;
mode-set=0,2,4,7
a=rmcap:1,3 audio AMR-WB/16000/1
a=rmcap:2 audio AMR/8000/1
a=mfcap:1,2 mode-change-capability=1
a=mfcap:3 mode-change-capability=2
a=pcfg:1 m=1 pt=1:96
a=pcfg:2 m=2 pt=2:97
a=pcfg:3 m=3 pt=3:98
m=audio 54322 RTP/AVP 96
a=rtpmap:96 AMR-WB/16000/1
a=fmtp:96 mode-change-capability=1; max-red=220;
mode-set=0,2,4,7
a=rmcap:4 audio AMR/8000/1
a=rmcap:5 audio OPUS/48000/2
a=mfcap:5 minptime=40
a=mfcap:4 mode-change-capability=1
a=pcfg:1 m=4 pt=4:97
a=pcfg:4 m=5 pt=5:101
</pre><a href="#section-14.3.1.1-2" class="pilcrow">¶</a>
</div>
<p id="section-14.3.1.1-3">In this example, the potential configuration
            number "1" is repeated when referring to media and media-format
     capability used for the Payload Type 96. This
            implies that both media capabilities 2 and 4, along
            with their media-format capabilities, <span class="bcp14">MUST</span> refer to the
            same codec configuration, as per the definition of
            IDENTICAL-PER-PT.<a href="#section-14.3.1.1-3" class="pilcrow">¶</a></p>
</section>
</section>
<section id="section-14.3.2">
          <h4 id="name-recommendation-dealing-with-">
<a href="#section-14.3.2" class="section-number selfRef">14.3.2. </a><a href="#name-recommendation-dealing-with-" class="section-name selfRef">Recommendation: Dealing with Latent Configurations</a>
          </h4>
<p id="section-14.3.2-1"><span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span> adds the notion of a latent
   configuration that provides configuration information that may be
   used to guide a
          subsequent offer/exchange -- e.g., by adding another media stream or using
          alternative codec combinations not currently offered. Latent configurations
          have configuration numbers that cannot overlap with the potential configuration
          numbers <span>[<a href="#RFC6871" class="xref">RFC6871</a>]</span>. Supported combinations of potential and
          latent configurations are indicated by use of the "a=sescap" attribute;
          however, use of this attribute is not recommended with multiplexed media,
          since it requires the use of unique configuration numbers across the SDP.
          Taken together, this means there is no well-defined way to indicate supported
          combinations of latent configurations, or combinations of latent and potential
          configurations with multiplexed media. It is still allowed to
          use the latent configuration attribute; however, the limitations
          above will apply. To determine valid combinations, actual
          negotiation will have to be attempted subsequently instead.<a href="#section-14.3.2-1" class="pilcrow">¶</a></p>
</section>
</section>
</div>
</section>
</div>
<section id="section-15">
      <h2 id="name-iana-considerations">
<a href="#section-15" class="section-number selfRef">15. </a><a href="#name-iana-considerations" class="section-name selfRef">IANA Considerations</a>
      </h2>
<p id="section-15-1"><a href="#sec-mux-cat-iana" class="xref">Section 15.1</a> defines a new
      subregistry, which has been
       added by the IANA, for identifying the initial registrations for
       various multiplexing categories applicable, as described in this document.<a href="#section-15-1" class="pilcrow">¶</a></p>
<p id="section-15-2">IANA has added a new column named "Mux Category"
       to several of the subregistries in the "Session Description Protocol
       (SDP) Parameters" registry. The tables in <a href="#sec-mux-cat-values-iana" class="xref">Section 15.2</a>
       identify the names of entries in the existing subregistry and specify the
       value to be put in the new "Mux Category" column of the associated IANA
       registry for each.<a href="#section-15-2" class="pilcrow">¶</a></p>
<div id="sec-mux-cat-iana">
<section id="section-15.1">
        <h3 id="name-new-multiplexing-categories">
<a href="#section-15.1" class="section-number selfRef">15.1. </a><a href="#name-new-multiplexing-categories" class="section-name selfRef">New "Multiplexing Categories" Subregistry</a>
        </h3>
<p id="section-15.1-1">A new subregistry has been created. It is called "Multiplexing
   Categories" and has the following registrations
          initially:<a href="#section-15.1-1" class="pilcrow">¶</a></p>
<table class="left" id="table-80">
          <caption><a href="#table-80" class="selfRef">Table 80</a></caption>
<thead>
            <tr>
              <th class="text-left" rowspan="1" colspan="1">Multiplexing Categories</th>
              <th class="text-left" rowspan="1" colspan="1">Reference</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">SUM</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
            <tr>
              <td class="text-left" rowspan="1" colspan="1">TBD</td>
              <td class="text-left" rowspan="1" colspan="1">RFC 8859</td>
            </tr>
          </tbody>
        </table>
<p id="section-15.1-3">Further entries can be registered using Standard Actions policies
         outlined in <span>[<a href="#RFC8126" class="xref">RFC8126</a>]</span>, which requires IESG review and
         approval and Standards Track IETF RFC publication.<a href="#section-15.1-3" class="pilcrow">¶</a></p>
<p id="section-15.1-4">Each registration needs to indicate the multiplexing category value
         to be added to the "Multiplexing Categories" subregistry, as defined
         in this section.<a href="#section-15.1-4" class="pilcrow">¶</a></p>
<p id="section-15.1-5">Such a registration <span class="bcp14">MUST</span> also indicate the applicability of the
         newly defined multiplexing category value to various subregistries
         defined in the "Session Description Protocol (SDP) Parameters" registry.<a href="#section-15.1-5" class="pilcrow">¶</a></p>
</section>
</div>
<div id="sec-mux-cat-values-iana">
<section id="section-15.2">
        <h3 id="name-mux-category-column-for-sub">
<a href="#section-15.2" class="section-number selfRef">15.2. </a><a href="#name-mux-category-column-for-sub" class="section-name selfRef">"Mux Category" Column for Subregistries</a>
        </h3>
<p id="section-15.2-1">Each subsection identifies a subregistry of the "Session Description
        Protocol (SDP) Parameters" registry. The tables list the column that
        identifies the SDP attribute name/Token/Value from the corresponding
        subregistries and the values to be used for the new "Mux Category" column
        to be added.<a href="#section-15.2-1" class="pilcrow">¶</a></p>
<p id="section-15.2-2">Entries in the existing subregistries of the "Session Description
        Protocol (SDP) Parameters" registry that lack a value for the
        "Mux Category" in this specification will get a value of "TBD".<a href="#section-15.2-2" class="pilcrow">¶</a></p>
<p id="section-15.2-3">The registration policy for updates to the "Mux Category" column values 
        for existing parameters, or when registering new parameters, is beyond the 
        scope of this document. The registration policy  for the affected table is 
        defined in <span>[<a href="#RFC8866" class="xref">RFC8866</a>]</span>.<a href="#section-15.2-3" class="pilcrow">¶</a></p>
<section id="section-15.2.1">
          <h4 id="name-table-sdp-bwtype">
<a href="#section-15.2.1" class="section-number selfRef">15.2.1. </a><a href="#name-table-sdp-bwtype" class="section-name selfRef">Table: SDP bwtype</a>
          </h4>
<p id="section-15.2.1-1">The following values have been added to the "bwtype" subregistry
         of the "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC as well
         as the previous references.<a href="#section-15.2.1-1" class="pilcrow">¶</a></p>
<table class="left" id="table-81">
            <caption><a href="#table-81" class="selfRef">Table 81</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">SDP Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">CT</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">AS</td>
                <td class="text-left" rowspan="1" colspan="1">SUM</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">RS</td>
                <td class="text-left" rowspan="1" colspan="1">SUM</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">RR</td>
                <td class="text-left" rowspan="1" colspan="1">SUM</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">TIAS</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.2">
          <h4 id="name-table-attribute-name">
<a href="#section-15.2.2" class="section-number selfRef">15.2.2. </a><a href="#name-table-attribute-name" class="section-name selfRef">Table: attribute-name</a>
          </h4>
<p id="section-15.2.2-1">The following values have been added to the "attribute-name"
          (formerly "att-field") subregistry of the "Session Description
          Protocol (SDP) Parameters" registry.  The references have been
          updated to point to this RFC as well as the previous references.<a href="#section-15.2.2-1" class="pilcrow">¶</a></p>
<p id="section-15.2.2-2">NOTE: The attributes from <span>[<a href="#I-D.ietf-rmt-flute-sdp" class="xref">FLUTE</a>]</span>
          ("flute-tsi", "flute-ch", "FEC-declaration", "FEC-OTI-extension",
          "content-desc") were not analyzed for their multiplexing behavior,
          due to the expired status of the draft. For the purposes of this
          specification, the multiplexing category of "TBD" is assigned.<a href="#section-15.2.2-2" class="pilcrow">¶</a></p>
<table class="left" id="table-82">
            <caption><a href="#table-82" class="selfRef">Table 82</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">SDP Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cat</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">keywds</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">type</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">type:broadcast</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">type:H332</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">type:meeting</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">type:moderated</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">type:test</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">charset</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">charset:iso8895-1</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">tool</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ipbcp</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">group</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ice-lite</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ice-options</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bcastversion</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3GPP-Integrity-Key</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3GPP-SDP-Auth</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">alt-group</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">PSCid</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bc_service</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bc_program</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bc_service_package</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sescap</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtsp-ice-d-m</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">recvonly</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sendrecv</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sendonly</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sdplang</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">lang</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">h248item</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sqn</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cdsc</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cpar</td>
                <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cparmin</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cparmax</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp-xr</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">maxprate</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">setup</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">connection</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">key-mgmt</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">source-filter</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">inactive</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fingerprint</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">flute-tsi</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">flute-ch</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC-declaration</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC-OTI-extension</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">content-desc</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ice-pwd</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ice-ufrag</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">stkmstream</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">extmap</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">qos-mech-send</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">qos-mech-recv</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">csup</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">creq</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">acap</td>
                <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">tcap</td>
                <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3GPP-QoE-Metrics</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3GPP-Asset-Information</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mbms-mode</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mbms-repair</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ike-setup</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">psk-fingerprint</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">multicast-rtcp</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rmcap</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omcap</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mfcap</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mscap</td>
                <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3gpp.iut.replication</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bcap</td>
                <td class="text-left" rowspan="1" colspan="1">INHERIT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ccap</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">icap</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">etag</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">duplication-delay</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">range</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">control</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mtag</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ts-refclk</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mediaclk</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">calgextmap</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ptime</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">orient</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">orient:portrait</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">orient:landscape</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">orient:seascape</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">framerate</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">quality</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtpmap</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fmtp</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtpred1</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtpred2</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxVersion</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38MaxBitRate</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxFillBitRemoval</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxTranscodingMMR</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxTranscodingJBIG</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxRateManagement</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxMaxBuffer</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxMaxDatagram</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxUdpEC</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">maxptime</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">des</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">curr</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">conf</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mid</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp-fb</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">label</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38VendorInfo</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">crypto</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">eecid</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aalType</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">capability</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">qosClass</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bcob</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">stc</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">upcc</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">atmQOSparms</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">atmTrfcDesc</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">abrParms</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">abrSetup</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bearerType</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">lij</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">anycast</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cache</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bearerSigIE</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aalApp</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cbrRate</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sbc</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">clkrec</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fec</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">prtfl</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">structure</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cpsSDUsize</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aal2CPS</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aal2CPSSDUrate</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aal2sscs3661unassured</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aal2sscs3661assured</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aal2sscs3662</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">aal5sscop</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">atmmap</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">silenceSupp</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ecan</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">gc</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">profileDesc</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">vsel</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">dsel</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fsel</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">onewaySel</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">codecconfig</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">isup_usi</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">uiLayer1_Prot</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">chain</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">floorctrl</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">confid</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">userid</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">floorid</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">accept-types</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">accept-wrapped-types</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">max-size</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">path</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">dccp-service-code</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp-mux</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">candidate</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ice-mismatch</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">remote-candidates</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">SRTPAuthentication</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">SRTPROCTxRate</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp-rsize</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">file-selector</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">file-transfer-id</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">file-disposition</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">file-date</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">file-icon</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">file-range</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">depend</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ssrc</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ssrc-group</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp-unicast</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">pcfg</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">acfg</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">zrtp-hash</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">X-predecbufsize</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">X-initpredecbufperiod</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">X-initpostdecbufperiod</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">X-decbyterate</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3gpp-videopostdecbufsize</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">framesize</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3GPP-SRTP-Config</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">alt</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">alt-default-id</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">3GPP-Adaption-Support</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mbms-flowid</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fec-source-flow</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fec-repair-flow</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">repair-window</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rams-updates</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">imageattr</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cfw-id</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">portmapping-req</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ecn-capable-rtp</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">visited-realm</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">secondary-realm</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-s-cksum</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-m-cksum</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-codecs</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-m-att</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-s-att</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-m-bw</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">omr-s-bw</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">msrp-cema</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">dccp-port</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">resource</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">channel</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cmid</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">content</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">lcfg</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">loopback</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">loopback-source</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">loopback-mirror</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">chatroom</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">altc</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxMaxIFP</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxUdpECDepth</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38FaxUdpFECMaxSpan</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">T38ModemType</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cs-correlation</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rtcp-idms</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cname</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">previous-ssrc</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fmtp</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ts-refclk</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mediaclk</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.3">
          <h4 id="name-table-content-sdp-parameter">
<a href="#section-15.2.3" class="section-number selfRef">15.2.3. </a><a href="#name-table-content-sdp-parameter" class="section-name selfRef">Table: content SDP Parameters</a>
          </h4>
<p id="section-15.2.3-1">The following values have been added to the
         "content SDP Parameters" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.3-1" class="pilcrow">¶</a></p>
<table class="left" id="table-83">
            <caption><a href="#table-83" class="selfRef">Table 83</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">SDP Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">slides</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">speaker</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sl</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">main</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">alt</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">g.3gpp.cat</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">g.3gpp.crs</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.4">
          <h4 id="name-table-semantics-for-the-gro">
<a href="#section-15.2.4" class="section-number selfRef">15.2.4. </a><a href="#name-table-semantics-for-the-gro" class="section-name selfRef">Table: Semantics for the "group" SDP Attribute</a>
          </h4>
<p id="section-15.2.4-1">The following values have been added to the
         "Semantics for the 'group' SDP Attribute" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC as well as
         the previous references.<a href="#section-15.2.4-1" class="pilcrow">¶</a></p>
<table class="left" id="table-84">
            <caption><a href="#table-84" class="selfRef">Table 84</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Token</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">LS</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FID</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">SRF</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ANAT</td>
                <td class="text-left" rowspan="1" colspan="1">CAUTION</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC-FR</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">CS</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">DDP</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">DUP</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.5">
          <h4 id="name-table-rtcp-fb-attribute-val">
<a href="#section-15.2.5" class="section-number selfRef">15.2.5. </a><a href="#name-table-rtcp-fb-attribute-val" class="section-name selfRef">Table: "rtcp-fb" Attribute Values</a>
          </h4>
<p id="section-15.2.5-1">The following values have been added to the
         "'rtcp-fb' Attribute Values" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC as well as
         the previous references.<a href="#section-15.2.5-1" class="pilcrow">¶</a></p>
<table class="left" id="table-85">
            <caption><a href="#table-85" class="selfRef">Table 85</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Value Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ack</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">app</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ccm</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">nack</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">trr-int</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.6">
          <h4 id="name-table-ack-and-nack-attribut">
<a href="#section-15.2.6" class="section-number selfRef">15.2.6. </a><a href="#name-table-ack-and-nack-attribut" class="section-name selfRef">Table: "ack" and "nack" Attribute Values</a>
          </h4>
<p id="section-15.2.6-1">The following values have been added to the
         "'ack' and 'nack' Attribute Values" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC as
         well as the previous references.<a href="#section-15.2.6-1" class="pilcrow">¶</a></p>
<table class="left" id="table-86">
            <caption><a href="#table-86" class="selfRef">Table 86</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Value Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sli</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">pli</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rpsi</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">app</td>
                <td class="text-left" rowspan="1" colspan="1">SPECIAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rai</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">tllei</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">pslei</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ecn</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.7">
          <h4 id="name-table-depend-sdp-attribute-">
<a href="#section-15.2.7" class="section-number selfRef">15.2.7. </a><a href="#name-table-depend-sdp-attribute-" class="section-name selfRef">Table: "depend" SDP Attribute Values</a>
          </h4>
<p id="section-15.2.7-1">The following values have been added to the
         "'depend' SDP Attribute Values" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.7-1" class="pilcrow">¶</a></p>
<table class="left" id="table-87">
            <caption><a href="#table-87" class="selfRef">Table 87</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Token</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">lay</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mdc</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.8">
          <h4 id="name-table-cs-correlation-attrib">
<a href="#section-15.2.8" class="section-number selfRef">15.2.8. </a><a href="#name-table-cs-correlation-attrib" class="section-name selfRef">Table: "cs-correlation" Attribute Values</a>
          </h4>
<p id="section-15.2.8-1">The following values have been added to the
         "'cs-correlation' Attribute Values" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.8-1" class="pilcrow">¶</a></p>
<table class="left" id="table-88">
            <caption><a href="#table-88" class="selfRef">Table 88</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Value</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">callerid</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">uuie</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">dtmf</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">external</td>
                <td class="text-left" rowspan="1" colspan="1">TBD</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.9">
          <h4 id="name-table-semantics-for-the-ssr">
<a href="#section-15.2.9" class="section-number selfRef">15.2.9. </a><a href="#name-table-semantics-for-the-ssr" class="section-name selfRef">Table: Semantics for the "ssrc-group" SDP Attribute</a>
          </h4>
<p id="section-15.2.9-1">The following values have been added to the "Semantics for the
 'ssrc-group' SDP Attribute"
         subregistry of the "Session Description Protocol (SDP) Parameters"
         registry. The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.9-1" class="pilcrow">¶</a></p>
<table class="left" id="table-89">
            <caption><a href="#table-89" class="selfRef">Table 89</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Token</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FID</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">FEC-FR</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">DUP</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.10">
          <h4 id="name-table-sdp-rtsp-key-manageme">
<a href="#section-15.2.10" class="section-number selfRef">15.2.10. </a><a href="#name-table-sdp-rtsp-key-manageme" class="section-name selfRef">Table: SDP/RTSP Key Management Protocol Identifiers</a>
          </h4>
<p id="section-15.2.10-1">The following values have been added to the
        "SDP/RTSP key management protocol identifiers" subregistry
        of the  "Session Description Protocol (SDP) Parameters" registry.
        The references have been updated to point to this RFC as well as
        the previous references.<a href="#section-15.2.10-1" class="pilcrow">¶</a></p>
<table class="left" id="table-90">
            <caption><a href="#table-90" class="selfRef">Table 90</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Value Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">mikey</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.11">
          <h4 id="name-table-codec-control-message">
<a href="#section-15.2.11" class="section-number selfRef">15.2.11. </a><a href="#name-table-codec-control-message" class="section-name selfRef">Table: Codec Control Messages</a>
          </h4>
<p id="section-15.2.11-1">The following values have been added to the
         "Codec Control Messages" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.11-1" class="pilcrow">¶</a></p>
<table class="left" id="table-91">
            <caption><a href="#table-91" class="selfRef">Table 91</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Value Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">fir</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">tmmbr</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">tstr</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">vbcm</td>
                <td class="text-left" rowspan="1" colspan="1">IDENTICAL-PER-PT</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.12">
          <h4 id="name-table-qos-mechanism-tokens">
<a href="#section-15.2.12" class="section-number selfRef">15.2.12. </a><a href="#name-table-qos-mechanism-tokens" class="section-name selfRef">Table: QoS Mechanism Tokens</a>
          </h4>
<p id="section-15.2.12-1">The following values have been added to the
         "QoS Mechanism Tokens" subregistry of the
         "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.12-1" class="pilcrow">¶</a></p>
<table class="left" id="table-92">
            <caption><a href="#table-92" class="selfRef">Table 92</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">QoS Mechanism</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">rsvp</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">nsis</td>
                <td class="text-left" rowspan="1" colspan="1">TRANSPORT</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.13">
          <h4 id="name-table-sdp-capability-negoti">
<a href="#section-15.2.13" class="section-number selfRef">15.2.13. </a><a href="#name-table-sdp-capability-negoti" class="section-name selfRef">Table: SDP Capability Negotiation Option Tags</a>
          </h4>
<p id="section-15.2.13-1">The following values have been added to the
         "SDP Capability Negotiation Option Tags" subregistry
         of the "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC
         as well as the previous references.<a href="#section-15.2.13-1" class="pilcrow">¶</a></p>
<table class="left" id="table-93">
            <caption><a href="#table-93" class="selfRef">Table 93</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Option Tag</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">cap-v0</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">med-v0</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">bcap-v0</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ccap-v0</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">icap-v0</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.14">
          <h4 id="name-table-timestamp-reference-c">
<a href="#section-15.2.14" class="section-number selfRef">15.2.14. </a><a href="#name-table-timestamp-reference-c" class="section-name selfRef">Table: Timestamp Reference Clock Source Parameters</a>
          </h4>
<p id="section-15.2.14-1">The following values have been added to the
         "Timestamp Reference Clock Source Parameters" subregistry
         of the "Session Description Protocol (SDP) Parameters" registry.
         The references have been updated to point to this RFC as well as
         the previous references.<a href="#section-15.2.14-1" class="pilcrow">¶</a></p>
<table class="left" id="table-94">
            <caption><a href="#table-94" class="selfRef">Table 94</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ntp</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">ptp</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">gps</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">gal</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">glonass</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">local</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">private</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
<section id="section-15.2.15">
          <h4 id="name-table-media-clock-source-pa">
<a href="#section-15.2.15" class="section-number selfRef">15.2.15. </a><a href="#name-table-media-clock-source-pa" class="section-name selfRef">Table: Media Clock Source Parameters</a>
          </h4>
<p id="section-15.2.15-1">The following values have been added to the
         "Media Clock Source Parameters" subregistry
         of the "Session Description Protocol (SDP) Parameters"
         registry. The references have been updated to point to
         this RFC as well as the previous references.<a href="#section-15.2.15-1" class="pilcrow">¶</a></p>
<table class="left" id="table-95">
            <caption><a href="#table-95" class="selfRef">Table 95</a></caption>
<thead>
              <tr>
                <th class="text-left" rowspan="1" colspan="1">Name</th>
                <th class="text-left" rowspan="1" colspan="1">Mux Category</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">sender</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">direct</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
              <tr>
                <td class="text-left" rowspan="1" colspan="1">IEEE1722</td>
                <td class="text-left" rowspan="1" colspan="1">NORMAL</td>
              </tr>
            </tbody>
          </table>
</section>
</section>
</div>
</section>
<section id="section-16">
      <h2 id="name-security-considerations">
<a href="#section-16" class="section-number selfRef">16. </a><a href="#name-security-considerations" class="section-name selfRef">Security Considerations</a>
      </h2>
<p id="section-16-1">
        The primary security considerations for RTP, including the way it is used here,
        are described in <span>[<a href="#RFC3550" class="xref">RFC3550</a>]</span> and <span>[<a href="#RFC3711" class="xref">RFC3711</a>]</span>.<a href="#section-16-1" class="pilcrow">¶</a></p>
<p id="section-16-2">
        When multiplexing SDP attributes with the category "CAUTION", the
        implementations should be aware of possible issues described in
        this specification.<a href="#section-16-2" class="pilcrow">¶</a></p>
</section>
<section id="section-17">
      <h2 id="name-references">
<a href="#section-17" class="section-number selfRef">17. </a><a href="#name-references" class="section-name selfRef">References</a>
      </h2>
<section id="section-17.1">
        <h3 id="name-normative-references">
<a href="#section-17.1" class="section-number selfRef">17.1. </a><a href="#name-normative-references" class="section-name selfRef">Normative References</a>
        </h3>
<dl class="references">
<dt id="RFC2119">[RFC2119]</dt>
        <dd>
<span class="refAuthor">Bradner, S.</span>, <span class="refTitle">"Key words for use in RFCs to Indicate Requirement Levels"</span>, <span class="seriesInfo">BCP 14</span>, <span class="seriesInfo">RFC 2119</span>, <span class="seriesInfo">DOI 10.17487/RFC2119</span>, <time datetime="1997-03" class="refDate">March 1997</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc2119">https://www.rfc-editor.org/info/rfc2119</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4566">[RFC4566]</dt>
        <dd>
<span class="refAuthor">Handley, M.</span><span class="refAuthor">, Jacobson, V.</span><span class="refAuthor">, and C. Perkins</span>, <span class="refTitle">"SDP: Session Description Protocol"</span>, <span class="seriesInfo">RFC 4566</span>, <span class="seriesInfo">DOI 10.17487/RFC4566</span>, <time datetime="2006-07" class="refDate">July 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4566">https://www.rfc-editor.org/info/rfc4566</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8126">[RFC8126]</dt>
        <dd>
<span class="refAuthor">Cotton, M.</span><span class="refAuthor">, Leiba, B.</span><span class="refAuthor">, and T. Narten</span>, <span class="refTitle">"Guidelines for Writing an IANA Considerations Section in RFCs"</span>, <span class="seriesInfo">BCP 26</span>, <span class="seriesInfo">RFC 8126</span>, <span class="seriesInfo">DOI 10.17487/RFC8126</span>, <time datetime="2017-06" class="refDate">June 2017</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8126">https://www.rfc-editor.org/info/rfc8126</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8174">[RFC8174]</dt>
        <dd>
<span class="refAuthor">Leiba, B.</span>, <span class="refTitle">"Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words"</span>, <span class="seriesInfo">BCP 14</span>, <span class="seriesInfo">RFC 8174</span>, <span class="seriesInfo">DOI 10.17487/RFC8174</span>, <time datetime="2017-05" class="refDate">May 2017</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8174">https://www.rfc-editor.org/info/rfc8174</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8843">[RFC8843]</dt>
      <dd>
<span class="refAuthor">Holmberg, C.</span><span class="refAuthor">, Alvestrand, H.</span><span class="refAuthor">, and C. Jennings</span>, <span class="refTitle">"Negotiating Media Multiplexing Using the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 8843</span>, <span class="seriesInfo">DOI 10.17487/RFC8843</span>, <time datetime="2021-01" class="refDate">January 2021</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8843">https://www.rfc-editor.org/info/rfc8843</a>&gt;</span>. </dd>
<dd class="break"></dd>
</dl>
</section>
<section id="section-17.2">
        <h3 id="name-informative-references">
<a href="#section-17.2" class="section-number selfRef">17.2. </a><a href="#name-informative-references" class="section-name selfRef">Informative References</a>
        </h3>
<dl class="references">
<dt id="I-D.ietf-rmt-flute-sdp">[FLUTE]</dt>
        <dd>
<span class="refAuthor">Walsh, R.</span><span class="refAuthor">, Peltotalo, J.</span><span class="refAuthor">, Peltotalo, S.</span><span class="refAuthor">, Curcio, I. D.</span><span class="refAuthor">, and H. Mehta</span>, <span class="refTitle">"SDP Descriptors for FLUTE"</span>, <span class="refContent">Work in Progress</span>, <span class="seriesInfo">Internet-Draft, draft-ietf-rmt-flute-sdp-03</span>, <time datetime="2012-09-12" class="refDate">12 September 2012</time>, <span>&lt;<a href="https://tools.ietf.org/html/draft-ietf-rmt-flute-sdp-03">https://tools.ietf.org/html/draft-ietf-rmt-flute-sdp-03</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="H.248.15">[H.248.15]</dt>
        <dd>
<span class="refAuthor">ITU-T</span>, <span class="refTitle">"Gateway control protocol: SDP ITU-T H.248 package attribute"</span>, <span class="seriesInfo">ITU-T Recommendation H.248.15</span>, <time datetime="2013-03" class="refDate">March 2013</time>, <span>&lt;<a href="https://www.itu.int/rec/T-REC-H.248.15">https://www.itu.int/rec/T-REC-H.248.15</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="IANA">[IANA]</dt>
        <dd>
<span class="refAuthor">IANA</span>, <span class="refTitle">"Session Description Protocol (SDP) Parameters"</span>, <span>&lt;<a href="https://www.iana.org/assignments/sdp-parameters">https://www.iana.org/assignments/sdp-parameters</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="IMS-CAT">[IMS-CAT]</dt>
        <dd>
<span class="refAuthor">3GPP</span>, <span class="refTitle">"IP Multimedia Subsystem (IMS) Customized Alerting Tones (CAT); Protocol specification"</span>, <span class="seriesInfo">Specification 24.182</span>, <span class="seriesInfo">Specification 24.182</span>, <time datetime="2015-01" class="refDate">January 2015</time>, <span>&lt;<a href="https://www.3gpp.org/ftp/Specs/html-info/24182.htm">https://www.3gpp.org/ftp/Specs/html-info/24182.htm</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="IMS-CRS">[IMS-CRS]</dt>
        <dd>
<span class="refAuthor">3GPP</span>, <span class="refTitle">"IP Multimedia Subsystem (IMS) Customized Ringing Signal (CRS); Protocol specification"</span>, <span class="seriesInfo">Specification 24.183</span>, <time datetime="2016-09" class="refDate">September 2016</time>, <span>&lt;<a href="https://www.3gpp.org/ftp/Specs/html-info/24183.htm">https://www.3gpp.org/ftp/Specs/html-info/24183.htm</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="IP-CALL">[IP-CALL]</dt>
        <dd>
<span class="refAuthor">3GPP</span>, <span class="refTitle">"IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3"</span>, <span class="seriesInfo">Specification 24.229</span>, <time datetime="2016-09" class="refDate">September 2016</time>, <span>&lt;<a href="https://www.3gpp.org/ftp/Specs/html-info/24229.htm">https://www.3gpp.org/ftp/Specs/html-info/24229.htm</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="Q.1970">[Q.1970]</dt>
        <dd>
<span class="refAuthor">ITU-T</span>, <span class="refTitle">"Q.1970: BICC IP bearer control protocol"</span>, <span class="seriesInfo">ITU-T Recommendation Q.1970</span>, <time datetime="2006-09" class="refDate">September 2006</time>, <span>&lt;<a href="https://www.itu.int/rec/T-REC-Q.1970-200609-I/en">https://www.itu.int/rec/T-REC-Q.1970-200609-I/en</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC2326">[RFC2326]</dt>
        <dd>
<span class="refAuthor">Schulzrinne, H.</span><span class="refAuthor">, Rao, A.</span><span class="refAuthor">, and R. Lanphier</span>, <span class="refTitle">"Real Time Streaming Protocol (RTSP)"</span>, <span class="seriesInfo">RFC 2326</span>, <span class="seriesInfo">DOI 10.17487/RFC2326</span>, <time datetime="1998-04" class="refDate">April 1998</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc2326">https://www.rfc-editor.org/info/rfc2326</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3108">[RFC3108]</dt>
        <dd>
<span class="refAuthor">Kumar, R.</span><span class="refAuthor"> and M. Mostafa</span>, <span class="refTitle">"Conventions for the use of the Session Description Protocol (SDP) for ATM Bearer Connections"</span>, <span class="seriesInfo">RFC 3108</span>, <span class="seriesInfo">DOI 10.17487/RFC3108</span>, <time datetime="2001-05" class="refDate">May 2001</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3108">https://www.rfc-editor.org/info/rfc3108</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3264">[RFC3264]</dt>
        <dd>
<span class="refAuthor">Rosenberg, J.</span><span class="refAuthor"> and H. Schulzrinne</span>, <span class="refTitle">"An Offer/Answer Model with Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 3264</span>, <span class="seriesInfo">DOI 10.17487/RFC3264</span>, <time datetime="2002-06" class="refDate">June 2002</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3264">https://www.rfc-editor.org/info/rfc3264</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3312">[RFC3312]</dt>
        <dd>
<span class="refAuthor">Camarillo, G., Ed.</span><span class="refAuthor">, Marshall, W., Ed.</span><span class="refAuthor">, and J. Rosenberg</span>, <span class="refTitle">"Integration of Resource Management and Session Initiation Protocol (SIP)"</span>, <span class="seriesInfo">RFC 3312</span>, <span class="seriesInfo">DOI 10.17487/RFC3312</span>, <time datetime="2002-10" class="refDate">October 2002</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3312">https://www.rfc-editor.org/info/rfc3312</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3407">[RFC3407]</dt>
        <dd>
<span class="refAuthor">Andreasen, F.</span>, <span class="refTitle">"Session Description Protocol (SDP) Simple Capability Declaration"</span>, <span class="seriesInfo">RFC 3407</span>, <span class="seriesInfo">DOI 10.17487/RFC3407</span>, <time datetime="2002-10" class="refDate">October 2002</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3407">https://www.rfc-editor.org/info/rfc3407</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3524">[RFC3524]</dt>
        <dd>
<span class="refAuthor">Camarillo, G.</span><span class="refAuthor"> and A. Monrad</span>, <span class="refTitle">"Mapping of Media Streams to Resource Reservation Flows"</span>, <span class="seriesInfo">RFC 3524</span>, <span class="seriesInfo">DOI 10.17487/RFC3524</span>, <time datetime="2003-04" class="refDate">April 2003</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3524">https://www.rfc-editor.org/info/rfc3524</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3550">[RFC3550]</dt>
        <dd>
<span class="refAuthor">Schulzrinne, H.</span><span class="refAuthor">, Casner, S.</span><span class="refAuthor">, Frederick, R.</span><span class="refAuthor">, and V. Jacobson</span>, <span class="refTitle">"RTP: A Transport Protocol for Real-Time Applications"</span>, <span class="seriesInfo">STD 64</span>, <span class="seriesInfo">RFC 3550</span>, <span class="seriesInfo">DOI 10.17487/RFC3550</span>, <time datetime="2003-07" class="refDate">July 2003</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3550">https://www.rfc-editor.org/info/rfc3550</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3556">[RFC3556]</dt>
        <dd>
<span class="refAuthor">Casner, S.</span>, <span class="refTitle">"Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth"</span>, <span class="seriesInfo">RFC 3556</span>, <span class="seriesInfo">DOI 10.17487/RFC3556</span>, <time datetime="2003-07" class="refDate">July 2003</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3556">https://www.rfc-editor.org/info/rfc3556</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3605">[RFC3605]</dt>
        <dd>
<span class="refAuthor">Huitema, C.</span>, <span class="refTitle">"Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 3605</span>, <span class="seriesInfo">DOI 10.17487/RFC3605</span>, <time datetime="2003-10" class="refDate">October 2003</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3605">https://www.rfc-editor.org/info/rfc3605</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3611">[RFC3611]</dt>
        <dd>
<span class="refAuthor">Friedman, T., Ed.</span><span class="refAuthor">, Caceres, R., Ed.</span><span class="refAuthor">, and A. Clark, Ed.</span>, <span class="refTitle">"RTP Control Protocol Extended Reports (RTCP XR)"</span>, <span class="seriesInfo">RFC 3611</span>, <span class="seriesInfo">DOI 10.17487/RFC3611</span>, <time datetime="2003-11" class="refDate">November 2003</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3611">https://www.rfc-editor.org/info/rfc3611</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3711">[RFC3711]</dt>
        <dd>
<span class="refAuthor">Baugher, M.</span><span class="refAuthor">, McGrew, D.</span><span class="refAuthor">, Naslund, M.</span><span class="refAuthor">, Carrara, E.</span><span class="refAuthor">, and K. Norrman</span>, <span class="refTitle">"The Secure Real-time Transport Protocol (SRTP)"</span>, <span class="seriesInfo">RFC 3711</span>, <span class="seriesInfo">DOI 10.17487/RFC3711</span>, <time datetime="2004-03" class="refDate">March 2004</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3711">https://www.rfc-editor.org/info/rfc3711</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC3890">[RFC3890]</dt>
        <dd>
<span class="refAuthor">Westerlund, M.</span>, <span class="refTitle">"A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 3890</span>, <span class="seriesInfo">DOI 10.17487/RFC3890</span>, <time datetime="2004-09" class="refDate">September 2004</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc3890">https://www.rfc-editor.org/info/rfc3890</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4091">[RFC4091]</dt>
        <dd>
<span class="refAuthor">Camarillo, G.</span><span class="refAuthor"> and J. Rosenberg</span>, <span class="refTitle">"The Alternative Network Address Types (ANAT) Semantics for the Session Description Protocol (SDP) Grouping Framework"</span>, <span class="seriesInfo">RFC 4091</span>, <span class="seriesInfo">DOI 10.17487/RFC4091</span>, <time datetime="2005-06" class="refDate">June 2005</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4091">https://www.rfc-editor.org/info/rfc4091</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4145">[RFC4145]</dt>
        <dd>
<span class="refAuthor">Yon, D.</span><span class="refAuthor"> and G. Camarillo</span>, <span class="refTitle">"TCP-Based Media Transport in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 4145</span>, <span class="seriesInfo">DOI 10.17487/RFC4145</span>, <time datetime="2005-09" class="refDate">September 2005</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4145">https://www.rfc-editor.org/info/rfc4145</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4567">[RFC4567]</dt>
        <dd>
<span class="refAuthor">Arkko, J.</span><span class="refAuthor">, Lindholm, F.</span><span class="refAuthor">, Naslund, M.</span><span class="refAuthor">, Norrman, K.</span><span class="refAuthor">, and E. Carrara</span>, <span class="refTitle">"Key Management Extensions for Session Description Protocol (SDP) and Real Time Streaming Protocol (RTSP)"</span>, <span class="seriesInfo">RFC 4567</span>, <span class="seriesInfo">DOI 10.17487/RFC4567</span>, <time datetime="2006-07" class="refDate">July 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4567">https://www.rfc-editor.org/info/rfc4567</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4568">[RFC4568]</dt>
        <dd>
<span class="refAuthor">Andreasen, F.</span><span class="refAuthor">, Baugher, M.</span><span class="refAuthor">, and D. Wing</span>, <span class="refTitle">"Session Description Protocol (SDP) Security Descriptions for Media Streams"</span>, <span class="seriesInfo">RFC 4568</span>, <span class="seriesInfo">DOI 10.17487/RFC4568</span>, <time datetime="2006-07" class="refDate">July 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4568">https://www.rfc-editor.org/info/rfc4568</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4570">[RFC4570]</dt>
        <dd>
<span class="refAuthor">Quinn, B.</span><span class="refAuthor"> and R. Finlayson</span>, <span class="refTitle">"Session Description Protocol (SDP) Source Filters"</span>, <span class="seriesInfo">RFC 4570</span>, <span class="seriesInfo">DOI 10.17487/RFC4570</span>, <time datetime="2006-07" class="refDate">July 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4570">https://www.rfc-editor.org/info/rfc4570</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4572">[RFC4572]</dt>
        <dd>
<span class="refAuthor">Lennox, J.</span>, <span class="refTitle">"Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 4572</span>, <span class="seriesInfo">DOI 10.17487/RFC4572</span>, <time datetime="2006-07" class="refDate">July 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4572">https://www.rfc-editor.org/info/rfc4572</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4574">[RFC4574]</dt>
        <dd>
<span class="refAuthor">Levin, O.</span><span class="refAuthor"> and G. Camarillo</span>, <span class="refTitle">"The Session Description Protocol (SDP) Label Attribute"</span>, <span class="seriesInfo">RFC 4574</span>, <span class="seriesInfo">DOI 10.17487/RFC4574</span>, <time datetime="2006-08" class="refDate">August 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4574">https://www.rfc-editor.org/info/rfc4574</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4583">[RFC4583]</dt>
        <dd>
<span class="refAuthor">Camarillo, G.</span>, <span class="refTitle">"Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams"</span>, <span class="seriesInfo">RFC 4583</span>, <span class="seriesInfo">DOI 10.17487/RFC4583</span>, <time datetime="2006-11" class="refDate">November 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4583">https://www.rfc-editor.org/info/rfc4583</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4585">[RFC4585]</dt>
        <dd>
<span class="refAuthor">Ott, J.</span><span class="refAuthor">, Wenger, S.</span><span class="refAuthor">, Sato, N.</span><span class="refAuthor">, Burmeister, C.</span><span class="refAuthor">, and J. Rey</span>, <span class="refTitle">"Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF)"</span>, <span class="seriesInfo">RFC 4585</span>, <span class="seriesInfo">DOI 10.17487/RFC4585</span>, <time datetime="2006-07" class="refDate">July 2006</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4585">https://www.rfc-editor.org/info/rfc4585</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4796">[RFC4796]</dt>
        <dd>
<span class="refAuthor">Hautakorpi, J.</span><span class="refAuthor"> and G. Camarillo</span>, <span class="refTitle">"The Session Description Protocol (SDP) Content Attribute"</span>, <span class="seriesInfo">RFC 4796</span>, <span class="seriesInfo">DOI 10.17487/RFC4796</span>, <time datetime="2007-02" class="refDate">February 2007</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4796">https://www.rfc-editor.org/info/rfc4796</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC4975">[RFC4975]</dt>
        <dd>
<span class="refAuthor">Campbell, B., Ed.</span><span class="refAuthor">, Mahy, R., Ed.</span><span class="refAuthor">, and C. Jennings, Ed.</span>, <span class="refTitle">"The Message Session Relay Protocol (MSRP)"</span>, <span class="seriesInfo">RFC 4975</span>, <span class="seriesInfo">DOI 10.17487/RFC4975</span>, <time datetime="2007-09" class="refDate">September 2007</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc4975">https://www.rfc-editor.org/info/rfc4975</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5104">[RFC5104]</dt>
        <dd>
<span class="refAuthor">Wenger, S.</span><span class="refAuthor">, Chandra, U.</span><span class="refAuthor">, Westerlund, M.</span><span class="refAuthor">, and B. Burman</span>, <span class="refTitle">"Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)"</span>, <span class="seriesInfo">RFC 5104</span>, <span class="seriesInfo">DOI 10.17487/RFC5104</span>, <time datetime="2008-02" class="refDate">February 2008</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5104">https://www.rfc-editor.org/info/rfc5104</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5109">[RFC5109]</dt>
        <dd>
<span class="refAuthor">Li, A., Ed.</span>, <span class="refTitle">"RTP Payload Format for Generic Forward Error Correction"</span>, <span class="seriesInfo">RFC 5109</span>, <span class="seriesInfo">DOI 10.17487/RFC5109</span>, <time datetime="2007-12" class="refDate">December 2007</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5109">https://www.rfc-editor.org/info/rfc5109</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5159">[RFC5159]</dt>
        <dd>
<span class="refAuthor">Dondeti, L., Ed.</span><span class="refAuthor"> and A. Jerichow</span>, <span class="refTitle">"Session Description Protocol (SDP) Attributes for Open Mobile Alliance (OMA) Broadcast (BCAST) Service and Content Protection"</span>, <span class="seriesInfo">RFC 5159</span>, <span class="seriesInfo">DOI 10.17487/RFC5159</span>, <time datetime="2008-03" class="refDate">March 2008</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5159">https://www.rfc-editor.org/info/rfc5159</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5285">[RFC5285]</dt>
        <dd>
<span class="refAuthor">Singer, D.</span><span class="refAuthor"> and H. Desineni</span>, <span class="refTitle">"A General Mechanism for RTP Header Extensions"</span>, <span class="seriesInfo">RFC 5285</span>, <span class="seriesInfo">DOI 10.17487/RFC5285</span>, <time datetime="2008-07" class="refDate">July 2008</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5285">https://www.rfc-editor.org/info/rfc5285</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5432">[RFC5432]</dt>
        <dd>
<span class="refAuthor">Polk, J.</span><span class="refAuthor">, Dhesikan, S.</span><span class="refAuthor">, and G. Camarillo</span>, <span class="refTitle">"Quality of Service (QoS) Mechanism Selection in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 5432</span>, <span class="seriesInfo">DOI 10.17487/RFC5432</span>, <time datetime="2009-03" class="refDate">March 2009</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5432">https://www.rfc-editor.org/info/rfc5432</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5506">[RFC5506]</dt>
        <dd>
<span class="refAuthor">Johansson, I.</span><span class="refAuthor"> and M. Westerlund</span>, <span class="refTitle">"Support for Reduced-Size Real-Time Transport Control Protocol (RTCP): Opportunities and Consequences"</span>, <span class="seriesInfo">RFC 5506</span>, <span class="seriesInfo">DOI 10.17487/RFC5506</span>, <time datetime="2009-04" class="refDate">April 2009</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5506">https://www.rfc-editor.org/info/rfc5506</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5547">[RFC5547]</dt>
        <dd>
<span class="refAuthor">Garcia-Martin, M.</span><span class="refAuthor">, Isomaki, M.</span><span class="refAuthor">, Camarillo, G.</span><span class="refAuthor">, Loreto, S.</span><span class="refAuthor">, and P. Kyzivat</span>, <span class="refTitle">"A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer"</span>, <span class="seriesInfo">RFC 5547</span>, <span class="seriesInfo">DOI 10.17487/RFC5547</span>, <time datetime="2009-05" class="refDate">May 2009</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5547">https://www.rfc-editor.org/info/rfc5547</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5576">[RFC5576]</dt>
        <dd>
<span class="refAuthor">Lennox, J.</span><span class="refAuthor">, Ott, J.</span><span class="refAuthor">, and T. Schierl</span>, <span class="refTitle">"Source-Specific Media Attributes in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 5576</span>, <span class="seriesInfo">DOI 10.17487/RFC5576</span>, <time datetime="2009-06" class="refDate">June 2009</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5576">https://www.rfc-editor.org/info/rfc5576</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5583">[RFC5583]</dt>
        <dd>
<span class="refAuthor">Schierl, T.</span><span class="refAuthor"> and S. Wenger</span>, <span class="refTitle">"Signaling Media Decoding Dependency in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 5583</span>, <span class="seriesInfo">DOI 10.17487/RFC5583</span>, <time datetime="2009-07" class="refDate">July 2009</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5583">https://www.rfc-editor.org/info/rfc5583</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5760">[RFC5760]</dt>
        <dd>
<span class="refAuthor">Ott, J.</span><span class="refAuthor">, Chesterfield, J.</span><span class="refAuthor">, and E. Schooler</span>, <span class="refTitle">"RTP Control Protocol (RTCP) Extensions for Single-Source Multicast Sessions with Unicast Feedback"</span>, <span class="seriesInfo">RFC 5760</span>, <span class="seriesInfo">DOI 10.17487/RFC5760</span>, <time datetime="2010-02" class="refDate">February 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5760">https://www.rfc-editor.org/info/rfc5760</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5761">[RFC5761]</dt>
        <dd>
<span class="refAuthor">Perkins, C.</span><span class="refAuthor"> and M. Westerlund</span>, <span class="refTitle">"Multiplexing RTP Data and Control Packets on a Single Port"</span>, <span class="seriesInfo">RFC 5761</span>, <span class="seriesInfo">DOI 10.17487/RFC5761</span>, <time datetime="2010-04" class="refDate">April 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5761">https://www.rfc-editor.org/info/rfc5761</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5762">[RFC5762]</dt>
        <dd>
<span class="refAuthor">Perkins, C.</span>, <span class="refTitle">"RTP and the Datagram Congestion Control Protocol (DCCP)"</span>, <span class="seriesInfo">RFC 5762</span>, <span class="seriesInfo">DOI 10.17487/RFC5762</span>, <time datetime="2010-04" class="refDate">April 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5762">https://www.rfc-editor.org/info/rfc5762</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5763">[RFC5763]</dt>
        <dd>
<span class="refAuthor">Fischl, J.</span><span class="refAuthor">, Tschofenig, H.</span><span class="refAuthor">, and E. Rescorla</span>, <span class="refTitle">"Framework for Establishing a Secure Real-time Transport Protocol (SRTP) Security Context Using Datagram Transport Layer Security (DTLS)"</span>, <span class="seriesInfo">RFC 5763</span>, <span class="seriesInfo">DOI 10.17487/RFC5763</span>, <time datetime="2010-05" class="refDate">May 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5763">https://www.rfc-editor.org/info/rfc5763</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5888">[RFC5888]</dt>
        <dd>
<span class="refAuthor">Camarillo, G.</span><span class="refAuthor"> and H. Schulzrinne</span>, <span class="refTitle">"The Session Description Protocol (SDP) Grouping Framework"</span>, <span class="seriesInfo">RFC 5888</span>, <span class="seriesInfo">DOI 10.17487/RFC5888</span>, <time datetime="2010-06" class="refDate">June 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5888">https://www.rfc-editor.org/info/rfc5888</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5939">[RFC5939]</dt>
        <dd>
<span class="refAuthor">Andreasen, F.</span>, <span class="refTitle">"Session Description Protocol (SDP) Capability Negotiation"</span>, <span class="seriesInfo">RFC 5939</span>, <span class="seriesInfo">DOI 10.17487/RFC5939</span>, <time datetime="2010-09" class="refDate">September 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5939">https://www.rfc-editor.org/info/rfc5939</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC5956">[RFC5956]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span>, <span class="refTitle">"Forward Error Correction Grouping Semantics in the Session Description Protocol"</span>, <span class="seriesInfo">RFC 5956</span>, <span class="seriesInfo">DOI 10.17487/RFC5956</span>, <time datetime="2010-09" class="refDate">September 2010</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc5956">https://www.rfc-editor.org/info/rfc5956</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6064">[RFC6064]</dt>
        <dd>
<span class="refAuthor">Westerlund, M.</span><span class="refAuthor"> and P. Frojdh</span>, <span class="refTitle">"SDP and RTSP Extensions Defined for 3GPP Packet-Switched Streaming Service and Multimedia Broadcast/Multicast Service"</span>, <span class="seriesInfo">RFC 6064</span>, <span class="seriesInfo">DOI 10.17487/RFC6064</span>, <time datetime="2011-01" class="refDate">January 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6064">https://www.rfc-editor.org/info/rfc6064</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6128">[RFC6128]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span>, <span class="refTitle">"RTP Control Protocol (RTCP) Port for Source-Specific Multicast (SSM) Sessions"</span>, <span class="seriesInfo">RFC 6128</span>, <span class="seriesInfo">DOI 10.17487/RFC6128</span>, <time datetime="2011-02" class="refDate">February 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6128">https://www.rfc-editor.org/info/rfc6128</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6189">[RFC6189]</dt>
        <dd>
<span class="refAuthor">Zimmermann, P.</span><span class="refAuthor">, Johnston, A., Ed.</span><span class="refAuthor">, and J. Callas</span>, <span class="refTitle">"ZRTP: Media Path Key Agreement for Unicast Secure RTP"</span>, <span class="seriesInfo">RFC 6189</span>, <span class="seriesInfo">DOI 10.17487/RFC6189</span>, <time datetime="2011-04" class="refDate">April 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6189">https://www.rfc-editor.org/info/rfc6189</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6193">[RFC6193]</dt>
        <dd>
<span class="refAuthor">Saito, M.</span><span class="refAuthor">, Wing, D.</span><span class="refAuthor">, and M. Toyama</span>, <span class="refTitle">"Media Description for the Internet Key Exchange Protocol (IKE) in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 6193</span>, <span class="seriesInfo">DOI 10.17487/RFC6193</span>, <time datetime="2011-04" class="refDate">April 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6193">https://www.rfc-editor.org/info/rfc6193</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6230">[RFC6230]</dt>
        <dd>
<span class="refAuthor">Boulton, C.</span><span class="refAuthor">, Melanchuk, T.</span><span class="refAuthor">, and S. McGlashan</span>, <span class="refTitle">"Media Control Channel Framework"</span>, <span class="seriesInfo">RFC 6230</span>, <span class="seriesInfo">DOI 10.17487/RFC6230</span>, <time datetime="2011-05" class="refDate">May 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6230">https://www.rfc-editor.org/info/rfc6230</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6236">[RFC6236]</dt>
        <dd>
<span class="refAuthor">Johansson, I.</span><span class="refAuthor"> and K. Jung</span>, <span class="refTitle">"Negotiation of Generic Image Attributes in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 6236</span>, <span class="seriesInfo">DOI 10.17487/RFC6236</span>, <time datetime="2011-05" class="refDate">May 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6236">https://www.rfc-editor.org/info/rfc6236</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6284">[RFC6284]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span><span class="refAuthor">, Wing, D.</span><span class="refAuthor">, and T. Van Caenegem</span>, <span class="refTitle">"Port Mapping between Unicast and Multicast RTP Sessions"</span>, <span class="seriesInfo">RFC 6284</span>, <span class="seriesInfo">DOI 10.17487/RFC6284</span>, <time datetime="2011-06" class="refDate">June 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6284">https://www.rfc-editor.org/info/rfc6284</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6285">[RFC6285]</dt>
        <dd>
<span class="refAuthor">Ver Steeg, B.</span><span class="refAuthor">, Begen, A.</span><span class="refAuthor">, Van Caenegem, T.</span><span class="refAuthor">, and Z. Vax</span>, <span class="refTitle">"Unicast-Based Rapid Acquisition of Multicast RTP Sessions"</span>, <span class="seriesInfo">RFC 6285</span>, <span class="seriesInfo">DOI 10.17487/RFC6285</span>, <time datetime="2011-06" class="refDate">June 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6285">https://www.rfc-editor.org/info/rfc6285</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6364">[RFC6364]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span>, <span class="refTitle">"Session Description Protocol Elements for the Forward Error Correction (FEC) Framework"</span>, <span class="seriesInfo">RFC 6364</span>, <span class="seriesInfo">DOI 10.17487/RFC6364</span>, <time datetime="2011-10" class="refDate">October 2011</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6364">https://www.rfc-editor.org/info/rfc6364</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6642">[RFC6642]</dt>
        <dd>
<span class="refAuthor">Wu, Q., Ed.</span><span class="refAuthor">, Xia, F.</span><span class="refAuthor">, and R. Even</span>, <span class="refTitle">"RTP Control Protocol (RTCP) Extension for a Third-Party Loss Report"</span>, <span class="seriesInfo">RFC 6642</span>, <span class="seriesInfo">DOI 10.17487/RFC6642</span>, <time datetime="2012-06" class="refDate">June 2012</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6642">https://www.rfc-editor.org/info/rfc6642</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6679">[RFC6679]</dt>
        <dd>
<span class="refAuthor">Westerlund, M.</span><span class="refAuthor">, Johansson, I.</span><span class="refAuthor">, Perkins, C.</span><span class="refAuthor">, O'Hanlon, P.</span><span class="refAuthor">, and K. Carlberg</span>, <span class="refTitle">"Explicit Congestion Notification (ECN) for RTP over UDP"</span>, <span class="seriesInfo">RFC 6679</span>, <span class="seriesInfo">DOI 10.17487/RFC6679</span>, <time datetime="2012-08" class="refDate">August 2012</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6679">https://www.rfc-editor.org/info/rfc6679</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6714">[RFC6714]</dt>
        <dd>
<span class="refAuthor">Holmberg, C.</span><span class="refAuthor">, Blau, S.</span><span class="refAuthor">, and E. Burger</span>, <span class="refTitle">"Connection Establishment for Media Anchoring (CEMA) for the Message Session Relay Protocol (MSRP)"</span>, <span class="seriesInfo">RFC 6714</span>, <span class="seriesInfo">DOI 10.17487/RFC6714</span>, <time datetime="2012-08" class="refDate">August 2012</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6714">https://www.rfc-editor.org/info/rfc6714</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6773">[RFC6773]</dt>
        <dd>
<span class="refAuthor">Phelan, T.</span><span class="refAuthor">, Fairhurst, G.</span><span class="refAuthor">, and C. Perkins</span>, <span class="refTitle">"DCCP-UDP: A Datagram Congestion Control Protocol UDP Encapsulation for NAT Traversal"</span>, <span class="seriesInfo">RFC 6773</span>, <span class="seriesInfo">DOI 10.17487/RFC6773</span>, <time datetime="2012-11" class="refDate">November 2012</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6773">https://www.rfc-editor.org/info/rfc6773</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6787">[RFC6787]</dt>
        <dd>
<span class="refAuthor">Burnett, D.</span><span class="refAuthor"> and S. Shanmugham</span>, <span class="refTitle">"Media Resource Control Protocol Version 2 (MRCPv2)"</span>, <span class="seriesInfo">RFC 6787</span>, <span class="seriesInfo">DOI 10.17487/RFC6787</span>, <time datetime="2012-11" class="refDate">November 2012</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6787">https://www.rfc-editor.org/info/rfc6787</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6849">[RFC6849]</dt>
        <dd>
<span class="refAuthor">Kaplan, H., Ed.</span><span class="refAuthor">, Hedayat, K.</span><span class="refAuthor">, Venna, N.</span><span class="refAuthor">, Jones, P.</span><span class="refAuthor">, and N. Stratton</span>, <span class="refTitle">"An Extension to the Session Description Protocol (SDP) and Real-time Transport Protocol (RTP) for Media Loopback"</span>, <span class="seriesInfo">RFC 6849</span>, <span class="seriesInfo">DOI 10.17487/RFC6849</span>, <time datetime="2013-02" class="refDate">February 2013</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6849">https://www.rfc-editor.org/info/rfc6849</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6871">[RFC6871]</dt>
        <dd>
<span class="refAuthor">Gilman, R.</span><span class="refAuthor">, Even, R.</span><span class="refAuthor">, and F. Andreasen</span>, <span class="refTitle">"Session Description Protocol (SDP) Media Capabilities Negotiation"</span>, <span class="seriesInfo">RFC 6871</span>, <span class="seriesInfo">DOI 10.17487/RFC6871</span>, <time datetime="2013-02" class="refDate">February 2013</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6871">https://www.rfc-editor.org/info/rfc6871</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC6947">[RFC6947]</dt>
        <dd>
<span class="refAuthor">Boucadair, M.</span><span class="refAuthor">, Kaplan, H.</span><span class="refAuthor">, Gilman, R.</span><span class="refAuthor">, and S. Veikkolainen</span>, <span class="refTitle">"The Session Description Protocol (SDP) Alternate Connectivity (ALTC) Attribute"</span>, <span class="seriesInfo">RFC 6947</span>, <span class="seriesInfo">DOI 10.17487/RFC6947</span>, <time datetime="2013-05" class="refDate">May 2013</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc6947">https://www.rfc-editor.org/info/rfc6947</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7006">[RFC7006]</dt>
        <dd>
<span class="refAuthor">Garcia-Martin, M.</span><span class="refAuthor">, Veikkolainen, S.</span><span class="refAuthor">, and R. Gilman</span>, <span class="refTitle">"Miscellaneous Capabilities Negotiation in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 7006</span>, <span class="seriesInfo">DOI 10.17487/RFC7006</span>, <time datetime="2013-09" class="refDate">September 2013</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7006">https://www.rfc-editor.org/info/rfc7006</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7104">[RFC7104]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span><span class="refAuthor">, Cai, Y.</span><span class="refAuthor">, and H. Ou</span>, <span class="refTitle">"Duplication Grouping Semantics in the Session Description Protocol"</span>, <span class="seriesInfo">RFC 7104</span>, <span class="seriesInfo">DOI 10.17487/RFC7104</span>, <time datetime="2014-01" class="refDate">January 2014</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7104">https://www.rfc-editor.org/info/rfc7104</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7195">[RFC7195]</dt>
        <dd>
<span class="refAuthor">Garcia-Martin, M.</span><span class="refAuthor"> and S. Veikkolainen</span>, <span class="refTitle">"Session Description Protocol (SDP) Extension for Setting Audio and Video Media Streams over Circuit-Switched Bearers in the Public Switched Telephone Network (PSTN)"</span>, <span class="seriesInfo">RFC 7195</span>, <span class="seriesInfo">DOI 10.17487/RFC7195</span>, <time datetime="2014-05" class="refDate">May 2014</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7195">https://www.rfc-editor.org/info/rfc7195</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7197">[RFC7197]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span><span class="refAuthor">, Cai, Y.</span><span class="refAuthor">, and H. Ou</span>, <span class="refTitle">"Duplication Delay Attribute in the Session Description Protocol"</span>, <span class="seriesInfo">RFC 7197</span>, <span class="seriesInfo">DOI 10.17487/RFC7197</span>, <time datetime="2014-04" class="refDate">April 2014</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7197">https://www.rfc-editor.org/info/rfc7197</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7266">[RFC7266]</dt>
        <dd>
<span class="refAuthor">Clark, A.</span><span class="refAuthor">, Wu, Q.</span><span class="refAuthor">, Schott, R.</span><span class="refAuthor">, and G. Zorn</span>, <span class="refTitle">"RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Mean Opinion Score (MOS) Metric Reporting"</span>, <span class="seriesInfo">RFC 7266</span>, <span class="seriesInfo">DOI 10.17487/RFC7266</span>, <time datetime="2014-06" class="refDate">June 2014</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7266">https://www.rfc-editor.org/info/rfc7266</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7272">[RFC7272]</dt>
        <dd>
<span class="refAuthor">van Brandenburg, R.</span><span class="refAuthor">, Stokking, H.</span><span class="refAuthor">, van Deventer, O.</span><span class="refAuthor">, Boronat, F.</span><span class="refAuthor">, Montagud, M.</span><span class="refAuthor">, and K. Gross</span>, <span class="refTitle">"Inter-Destination Media Synchronization (IDMS) Using the RTP Control Protocol (RTCP)"</span>, <span class="seriesInfo">RFC 7272</span>, <span class="seriesInfo">DOI 10.17487/RFC7272</span>, <time datetime="2014-06" class="refDate">June 2014</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7272">https://www.rfc-editor.org/info/rfc7272</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7273">[RFC7273]</dt>
        <dd>
<span class="refAuthor">Williams, A.</span><span class="refAuthor">, Gross, K.</span><span class="refAuthor">, van Brandenburg, R.</span><span class="refAuthor">, and H. Stokking</span>, <span class="refTitle">"RTP Clock Source Signalling"</span>, <span class="seriesInfo">RFC 7273</span>, <span class="seriesInfo">DOI 10.17487/RFC7273</span>, <time datetime="2014-06" class="refDate">June 2014</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7273">https://www.rfc-editor.org/info/rfc7273</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7657">[RFC7657]</dt>
        <dd>
<span class="refAuthor">Black, D., Ed.</span><span class="refAuthor"> and P. Jones</span>, <span class="refTitle">"Differentiated Services (Diffserv) and Real-Time Communication"</span>, <span class="seriesInfo">RFC 7657</span>, <span class="seriesInfo">DOI 10.17487/RFC7657</span>, <time datetime="2015-11" class="refDate">November 2015</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7657">https://www.rfc-editor.org/info/rfc7657</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC7826">[RFC7826]</dt>
        <dd>
<span class="refAuthor">Schulzrinne, H.</span><span class="refAuthor">, Rao, A.</span><span class="refAuthor">, Lanphier, R.</span><span class="refAuthor">, Westerlund, M.</span><span class="refAuthor">, and M. Stiemerling, Ed.</span>, <span class="refTitle">"Real-Time Streaming Protocol Version 2.0"</span>, <span class="seriesInfo">RFC 7826</span>, <span class="seriesInfo">DOI 10.17487/RFC7826</span>, <time datetime="2016-12" class="refDate">December 2016</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc7826">https://www.rfc-editor.org/info/rfc7826</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8122">[RFC8122]</dt>
        <dd>
<span class="refAuthor">Lennox, J.</span><span class="refAuthor"> and C. Holmberg</span>, <span class="refTitle">"Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP)"</span>, <span class="seriesInfo">RFC 8122</span>, <span class="seriesInfo">DOI 10.17487/RFC8122</span>, <time datetime="2017-03" class="refDate">March 2017</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8122">https://www.rfc-editor.org/info/rfc8122</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8285">[RFC8285]</dt>
        <dd>
<span class="refAuthor">Singer, D.</span><span class="refAuthor">, Desineni, H.</span><span class="refAuthor">, and R. Even, Ed.</span>, <span class="refTitle">"A General Mechanism for RTP Header Extensions"</span>, <span class="seriesInfo">RFC 8285</span>, <span class="seriesInfo">DOI 10.17487/RFC8285</span>, <time datetime="2017-10" class="refDate">October 2017</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8285">https://www.rfc-editor.org/info/rfc8285</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8445">[RFC8445]</dt>
        <dd>
<span class="refAuthor">Keranen, A.</span><span class="refAuthor">, Holmberg, C.</span><span class="refAuthor">, and J. Rosenberg</span>, <span class="refTitle">"Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal"</span>, <span class="seriesInfo">RFC 8445</span>, <span class="seriesInfo">DOI 10.17487/RFC8445</span>, <time datetime="2018-07" class="refDate">July 2018</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8445">https://www.rfc-editor.org/info/rfc8445</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8856">[RFC8856]</dt>
        <dd>
<span class="refAuthor">Camarillo, G.</span><span class="refAuthor">, Kristensen, T.</span><span class="refAuthor">, and C. Holmberg</span>, <span class="refTitle">"Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams"</span>, <span class="seriesInfo">RFC 8856</span>, <span class="seriesInfo">DOI 10.17487/RFC8856</span>, <time datetime="2021-01" class="refDate">January 2021</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8856">https://www.rfc-editor.org/info/rfc8856</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="RFC8866">[RFC8866]</dt>
        <dd>
<span class="refAuthor">Begen, A.</span><span class="refAuthor">, Kyzivat, P.</span><span class="refAuthor">, Perkins, C.</span><span class="refAuthor">, and M. Handley</span>, <span class="refTitle">"SDP: Session Description Protocol"</span>, <span class="seriesInfo">RFC 8866</span>, <span class="seriesInfo">DOI 10.17487/RFC8866</span>, <time datetime="2021-01" class="refDate">January 2021</time>, <span>&lt;<a href="https://www.rfc-editor.org/info/rfc8866">https://www.rfc-editor.org/info/rfc8866</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="T.38">[T.38]</dt>
        <dd>
<span class="refAuthor">ITU-T</span>, <span class="refTitle">"Procedures for real-time Group 3 facsimile communication over IP networks"</span>, <span class="seriesInfo">ITU-T Recommendation T.38</span>, <time datetime="2015-11" class="refDate">November 2015</time>, <span>&lt;<a href="https://www.itu.int/rec/T-REC-T.38/e">https://www.itu.int/rec/T-REC-T.38/e</a>&gt;</span>. </dd>
<dd class="break"></dd>
<dt id="TISPAN">[TISPAN]</dt>
      <dd>
<span class="refAuthor">ETSI</span>, <span class="refTitle">"Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based IPTV stage 3 specification"</span>, <span class="seriesInfo">Technical Specification 183 063 V2.1.0</span>, <time datetime="2008-06" class="refDate">June 2008</time>, <span>&lt;<a href="https://www.etsi.org/deliver/etsi_ts/183000_183099/183063/02.01.00_60/ts_183063v020100p.pdf">https://www.etsi.org/deliver/etsi_ts/183000_183099/183063/02.01.00_60/ts_183063v020100p.pdf</a>&gt;</span>. </dd>
<dd class="break"></dd>
</dl>
</section>
</section>
<section id="section-appendix.a">
      <h2 id="name-acknowledgements">
<a href="#name-acknowledgements" class="section-name selfRef">Acknowledgements</a>
      </h2>
<p id="section-appendix.a-1">
        I would like to thank <span class="contact-name">Cullen Jennings</span> and
 <span class="contact-name">Flemming Andreasen</span>
        for suggesting the categories, contributing text, and reviewing
        the draft of this document. I would also like to thank <span class="contact-name">Magnus Westerlund</span>,
        <span class="contact-name">Christer Holmberg</span>, <span class="contact-name">Jonathan    Lennox</span>, <span class="contact-name">Bo Burman</span>, <span class="contact-name">Ari Keränen</span>, and
        <span class="contact-name">Dan Wing</span> for suggesting structural changes that improved the
        document's readability.<a href="#section-appendix.a-1" class="pilcrow">¶</a></p>
<p id="section-appendix.a-2">
        I would like also to thank the following experts for their inputs and
        reviews as listed:<a href="#section-appendix.a-2" class="pilcrow">¶</a></p>
<ul class="ulEmpty compact">
<li class="ulEmpty compact" id="section-appendix.a-3.1">
          <p id="section-appendix.a-3.1.1"><span class="contact-name">Flemming Andreasen</span> (5.24, 5.32, 5.33, 14),<a href="#section-appendix.a-3.1.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.2">
          <p id="section-appendix.a-3.2.1"><span class="contact-name">Rohan Mahy</span> (5.54),<a href="#section-appendix.a-3.2.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.3">
          <p id="section-appendix.a-3.3.1"><span class="contact-name">Eric Burger</span> (5.26),<a href="#section-appendix.a-3.3.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.4">
          <p id="section-appendix.a-3.4.1"><span class="contact-name">Christian Huitema</span> (5.14),<a href="#section-appendix.a-3.4.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.5">
          <p id="section-appendix.a-3.5.1"><span class="contact-name">Christer Holmberg</span> (5.21, 5.26, 12.2, 12.3),<a href="#section-appendix.a-3.5.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.6">
          <p id="section-appendix.a-3.6.1"><span class="contact-name">Richard Ejzak</span> (5.44, 5.50, 5.51),<a href="#section-appendix.a-3.6.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.7">
          <p id="section-appendix.a-3.7.1"><span class="contact-name">Colin Perkins</span> (5.7, 5.8, 5.9, 5.55),<a href="#section-appendix.a-3.7.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.8">
          <p id="section-appendix.a-3.8.1"><span class="contact-name">Magnus Westerlund</span> (5.2, 5.3, 5.9, 5.27, 5.47, 6.1 - 6.3, 8.3, 7),<a href="#section-appendix.a-3.8.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.9">
          <p id="section-appendix.a-3.9.1"><span class="contact-name">Roni Even</span> (5.12, 5.27, 8.4),<a href="#section-appendix.a-3.9.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.10">
          <p id="section-appendix.a-3.10.1"><span class="contact-name">Subha Dhesikan</span> (5.6, 10),<a href="#section-appendix.a-3.10.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.11">
          <p id="section-appendix.a-3.11.1"><span class="contact-name">Dan Wing</span> (5.7, 5.12, 5.35, 5.39, 5.45),<a href="#section-appendix.a-3.11.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.12">
          <p id="section-appendix.a-3.12.1"><span class="contact-name">Cullen Jennings</span> (5.40),<a href="#section-appendix.a-3.12.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.13">
          <p id="section-appendix.a-3.13.1"><span class="contact-name">Ali C Begen</span> (5.1, 5.20, 5.22, 5.25, 5.38, 7.3, 8.2, 8.4, 8.6, 9.2, 13.1),<a href="#section-appendix.a-3.13.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.14">
          <p id="section-appendix.a-3.14.1"><span class="contact-name">Bo Burman</span> (7.2, 7.6),<a href="#section-appendix.a-3.14.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.15">
          <p id="section-appendix.a-3.15.1"><span class="contact-name">Charles Eckel</span> (5.15, 5.27, 5.28, 9.1, 8.5),<a href="#section-appendix.a-3.15.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.16">
          <p id="section-appendix.a-3.16.1"><span class="contact-name">Paul Kyzivat</span> (5.24),<a href="#section-appendix.a-3.16.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.17">
          <p id="section-appendix.a-3.17.1"><span class="contact-name">Ian Johansson</span> (5.15),<a href="#section-appendix.a-3.17.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.18">
          <p id="section-appendix.a-3.18.1"><span class="contact-name">Saravanan Shanmugham</span> (5.11),<a href="#section-appendix.a-3.18.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.19">
          <p id="section-appendix.a-3.19.1"><span class="contact-name">Paul E Jones</span> (5.30),<a href="#section-appendix.a-3.19.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.20">
          <p id="section-appendix.a-3.20.1"><span class="contact-name">Rajesh Kumar</span> (5.48),<a href="#section-appendix.a-3.20.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.21">
          <p id="section-appendix.a-3.21.1"><span class="contact-name">Jonathan Lennox</span> (5.36, 5, 15, 9.1, 11.1),<a href="#section-appendix.a-3.21.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.22">
          <p id="section-appendix.a-3.22.1"><span class="contact-name">Mo Zanaty</span> (5.4, 5.5, 5.23, 8.1, 8.3, 8.5, 12.1),<a href="#section-appendix.a-3.22.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.23">
          <p id="section-appendix.a-3.23.1"><span class="contact-name">Christian Huitema</span> (5.14),<a href="#section-appendix.a-3.23.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.24">
          <p id="section-appendix.a-3.24.1"><span class="contact-name">Qin Wu</span> (5.47, PM-Dir review),<a href="#section-appendix.a-3.24.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.25">
          <p id="section-appendix.a-3.25.1"><span class="contact-name">Hans Stokking</span> (5.43, 5.16),<a href="#section-appendix.a-3.25.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.26">
          <p id="section-appendix.a-3.26.1"><span class="contact-name">Christian Groves</span> (5.48, 5.52), and<a href="#section-appendix.a-3.26.1" class="pilcrow">¶</a></p>
</li>
        <li class="ulEmpty compact" id="section-appendix.a-3.27">
          <p id="section-appendix.a-3.27.1"><span class="contact-name">Thomas Stach</span>.<a href="#section-appendix.a-3.27.1" class="pilcrow">¶</a></p>
</li>
      </ul>
<p id="section-appendix.a-4">
          I would like to thank <span class="contact-name">Chris Lonvick</span> for the SECDIR
   review, <span class="contact-name">Dan Romascanu</span>
          for the Gen-ART review, and <span class="contact-name">Sabrina Tanamal</span> for the IANA review.<a href="#section-appendix.a-4" class="pilcrow">¶</a></p>
<p id="section-appendix.a-5">
       Thanks to <span class="contact-name">Ben Campbell</span> for Area Director review
       suggestions. Thanks to <span class="contact-name">Spencer Dawkins</span>, 
       <span class="contact-name">Stephen Farrel</span>, <span class="contact-name">Alissa Cooper</span>,
  <span class="contact-name">Mirja Kühlewind</span>, and the entire IESG
       for their reviews.<a href="#section-appendix.a-5" class="pilcrow">¶</a></p>
</section>
<div id="authors-addresses">
<section id="section-appendix.b">
      <h2 id="name-authors-address">
<a href="#name-authors-address" class="section-name selfRef">Author's Address</a>
      </h2>
<address class="vcard">
        <div dir="auto" class="left"><span class="fn nameRole">Suhas Nandakumar</span></div>
<div dir="auto" class="left"><span class="org">Cisco</span></div>
<div dir="auto" class="left"><span class="street-address">170 West Tasman Drive</span></div>
<div dir="auto" class="left">
<span class="locality">San Jose</span>, <span class="region">CA</span> <span class="postal-code">95134</span>
</div>
<div dir="auto" class="left"><span class="country-name">United States of America</span></div>
<div class="email">
<span>Email:</span>
<a href="mailto:snandaku@cisco.com" class="email">snandaku@cisco.com</a>
</div>
</address>
</section>
</div>
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