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<pre>Network Working Group C. Jennings
Request for Comments: 4770 Cisco Systems
Category: Standards Track J. Reschke, Ed.
greenbytes
January 2007
<span class="h1">vCard Extensions for Instant Messaging (IM)</span>
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document describes an extension to vCard to support Instant
Messaging (IM) and Presence Protocol (PP) applications. IM and PP
are becoming increasingly common ways of communicating, and users
want to save this contact information in their address books. It
allows a URI that is associated with IM or PP to be specified inside
a vCard.
Table of Contents
<a href="#section-1">1</a>. Overview ........................................................<a href="#page-2">2</a>
<a href="#section-2">2</a>. IANA Considerations .............................................<a href="#page-3">3</a>
<a href="#section-3">3</a>. Formal Grammar ..................................................<a href="#page-4">4</a>
<a href="#section-4">4</a>. Example .........................................................<a href="#page-4">4</a>
<a href="#section-5">5</a>. Security Considerations .........................................<a href="#page-4">4</a>
<a href="#section-6">6</a>. Acknowledgments .................................................<a href="#page-4">4</a>
<a href="#section-7">7</a>. References ......................................................<a href="#page-5">5</a>
<a href="#section-7.1">7.1</a>. Normative References .......................................<a href="#page-5">5</a>
<a href="#section-7.2">7.2</a>. Informational References ...................................<a href="#page-5">5</a>
<span class="grey">Jennings & Reschke Standards Track [Page 1]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-2" ></span>
<span class="grey"><a href="./rfc4770">RFC 4770</a> IMPP vCard January 2007</span>
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Overview</span>
As more and more people use various instant messaging (IM) and
presence protocol (PP) applications, it becomes important for them to
be able to share this contact address information, along with the
rest of their contact information. <a href="./rfc2425">RFC 2425</a> [<a href="#ref-1" title=""A MIME Content-Type for Directory Information"">1</a>] and <a href="./rfc2426">RFC 2426</a> [<a href="#ref-2" title=""vCard MIME Directory Profile"">2</a>]
define a standard format for this information, which is referred to
as vCard. This document defines a new type in a vCard for
representing instant IM and PP URIs. It is very similar to existing
types for representing email address and telephone contact
information.
The type entry to hold this new contact information is an IMPP type.
The IMPP entry has a single URI (see <a href="./rfc3986">RFC 3986</a> [<a href="#ref-3" title=""Uniform Resource Identifier (URI): Generic Syntax"">3</a>]) that indicates the
address of a service that provides IM, PP, or both. Also defined are
some parameters that give hints as to when certain URIs would be
appropriate. A given vCard can have multiple IMPP entries, but each
entry can contain only one URI. Each IMPP entry can contain multiple
parameters. Any combination of parameters is valid, although a
parameter should occur, at most, once in a given IMPP entry.
The type of URI indicates what protocols might be usable for
accessing it, but this document does not define any of the types.
For example, a URI type of
o "sip" [<a href="#ref-5" title=""SIP: Session Initiation Protocol"">5</a>] indicates to use SIP/SIMPLE,
o "xmpp" [<a href="#ref-6" title=""Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP)"">6</a>] indicates to use XMPP,
o "irc" indicates to use IRC,
o "ymsgr" indicates to use yahoo,
o "msn" might indicate to use Microsoft messenger,
o "aim" indicates to use AOL, and
o "im" [<a href="#ref-7" title=""Common Profile for Instant Messaging (CPIM)"">7</a>] or "pres" [<a href="#ref-8" title=""Common Profile for Presence (CPP)"">8</a>] indicates that a CPIM or CPP gateway should
be used.
The normative definition of this new vCard type is given in <a href="#section-2">Section</a>
<a href="#section-2">2</a>, and an informational ABNF is provided in <a href="#section-3">Section 3</a>.
<span class="grey">Jennings & Reschke Standards Track [Page 2]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-3" ></span>
<span class="grey"><a href="./rfc4770">RFC 4770</a> IMPP vCard January 2007</span>
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. IANA Considerations</span>
The required email to define this extension (as defined in <a href="./rfc2425">RFC 2425</a>
[<a href="#ref-1" title=""A MIME Content-Type for Directory Information"">1</a>]) was sent on October 29, 2004, to the ietf-mime-direct@imc.org
mailing list with the subject "Registration of text/directory MIME
type IMPP" (see <<a href="http://www.imc.org/ietf-mime-direct/mail-archive/msg00068.html">http://www.imc.org/ietf-mime-direct/mail-</a>
<a href="http://www.imc.org/ietf-mime-direct/mail-archive/msg00068.html">archive/msg00068.html</a>>).
This specification updates the "text/directory MIME Types"
subregistry in the "text/directory MIME Registrations" registry at
<a href="http://www.iana.org/assignments/text-directory-registrations">http://www.iana.org/assignments/text-directory-registrations</a> with the
following information:
Type name: IMPP
Type purpose: To specify the URI for instant messaging and presence
protocol communications with the object the vCard represents.
Type encoding: 8bit
Type value: A single URI. The type of the URI indicates the protocol
that can be used for this contact.
Type special notes: The type may include the type parameter "TYPE" to
specify an intended use for the URI. The TYPE parameter values
include one or more of the following:
o An indication of the type of communication for which this URI is
appropriate. This can be a value of PERSONAL or BUSINESS.
o An indication of the location of a device associated with this
URI. Values can be HOME, WORK, or MOBILE.
o The value PREF indicates this is a preferred address and has the
same semantics as the PREF value in a TEL type.
Additional information can be found in <a href="./rfc4770">RFC 4770</a>.
Intended usage: COMMON
<span class="grey">Jennings & Reschke Standards Track [Page 3]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-4" ></span>
<span class="grey"><a href="./rfc4770">RFC 4770</a> IMPP vCard January 2007</span>
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. Formal Grammar</span>
The following ABNF grammar [<a href="#ref-4" title=""Augmented BNF for Syntax Specifications: ABNF"">4</a>] extends the grammar found in <a href="./rfc2425">RFC 2425</a>
[<a href="#ref-1" title=""A MIME Content-Type for Directory Information"">1</a>] (<a href="#section-5.8.2">Section 5.8.2</a>) and <a href="./rfc2426">RFC 2426</a> [<a href="#ref-2" title=""vCard MIME Directory Profile"">2</a>] (<a href="#section-4">Section 4</a>).
;For name="IMPP"
param = impp-param ; Only impp parameters are allowed
value = URI
; URI defined in Section 3 of [<a href="#ref-3" title=""Uniform Resource Identifier (URI): Generic Syntax"">3</a>]
impp-param = "TYPE" "=" impp-type *("," impp-type)
impp-type = "PERSONAL" / "BUSINESS" / ; purpose of communications
"HOME" / "WORK" / "MOBILE" /
"PREF" /
iana-token / x-name;
; Values are case insensitive
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Example</span>
BEGIN:vCard
VERSION:3.0
FN:Alice Doe
IMPP;TYPE=personal,pref:im:alice@example.com
END:vCard
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Security Considerations</span>
This does not introduce additional security issues beyond the current
vCard specification. It is worth noting that many people consider
their presence information more sensitive than other address
information. Any system that stores or transfers vCards needs to
carefully consider the privacy issues around this information.
<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>. Acknowledgments</span>
Thanks to Brian Carpenter, Lars Eggert, Ted Hardie, Paul Hoffman, Sam
Roberts, and Pekka Pessi for their comments.
<span class="grey">Jennings & Reschke Standards Track [Page 4]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-5" ></span>
<span class="grey"><a href="./rfc4770">RFC 4770</a> IMPP vCard January 2007</span>
<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>. References</span>
<span class="h3"><a class="selflink" id="section-7.1" href="#section-7.1">7.1</a>. Normative References</span>
[<a id="ref-1">1</a>] Howes, T., Smith, M., and F. Dawson, "A MIME Content-Type for
Directory Information", <a href="./rfc2425">RFC 2425</a>, September 1998.
[<a id="ref-2">2</a>] Dawson, F. and T. Howes, "vCard MIME Directory Profile", <a href="./rfc2426">RFC</a>
<a href="./rfc2426">2426</a>, September 1998.
[<a id="ref-3">3</a>] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66, <a href="./rfc3986">RFC 3986</a>,
January 2005.
[<a id="ref-4">4</a>] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", <a href="./rfc4234">RFC 4234</a>, October 2005.
<span class="h3"><a class="selflink" id="section-7.2" href="#section-7.2">7.2</a>. Informational References</span>
[<a id="ref-5">5</a>] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP:
Session Initiation Protocol", <a href="./rfc3261">RFC 3261</a>, June 2002.
[<a id="ref-6">6</a>] Saint-Andre, P., "Internationalized Resource Identifiers (IRIs)
and Uniform Resource Identifiers (URIs) for the Extensible
Messaging and Presence Protocol (XMPP)", <a href="./rfc4622">RFC 4622</a>, July 2006.
[<a id="ref-7">7</a>] Peterson, J., "Common Profile for Instant Messaging (CPIM)", <a href="./rfc3860">RFC</a>
<a href="./rfc3860">3860</a>, August 2004.
[<a id="ref-8">8</a>] Peterson, J., "Common Profile for Presence (CPP)", <a href="./rfc3859">RFC 3859</a>,
August 2004.
<span class="grey">Jennings & Reschke Standards Track [Page 5]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-6" ></span>
<span class="grey"><a href="./rfc4770">RFC 4770</a> IMPP vCard January 2007</span>
Authors' Addresses
Cullen Jennings
Cisco Systems
170 West Tasman Drive
MS: SJC-21/2
San Jose, CA 95134
USA
Phone: +1 408 902-3341
EMail: fluffy@cisco.com
Julian F. Reschke (editor)
greenbytes GmbH
Hafenweg 16
Muenster, NW 48155
Germany
Phone: +49 251 2807760
EMail: julian.reschke@greenbytes.de
<span class="grey">Jennings & Reschke Standards Track [Page 6]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-7" ></span>
<span class="grey"><a href="./rfc4770">RFC 4770</a> IMPP vCard January 2007</span>
Full Copyright Statement
Copyright (C) The IETF Trust (2007).
This document is subject to the rights, licenses and restrictions
contained in <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a>, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST,
AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT
THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE.
Intellectual Property
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
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Copies of IPR disclosures made to the IETF Secretariat and any
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The IETF invites any interested party to bring to its attention any
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ietf-ipr@ietf.org.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Jennings & Reschke Standards Track [Page 7]
</pre>
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