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Network Working Group                                       C. Allocchio
Request for Comments: 2846                                    GARR-Italy
Category: Standards Track                                      June 2000


           GSTN Address Element Extensions in E-mail Services

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 Internet Society (2000).  All Rights Reserved.

Abstract

   There are numerous applications where there is a need for interaction
   between the GSTN addressing and Internet addressing.  This memo
   defines a full syntax for one specific case, where there is a need to
   represent GSTN addresses within Internet e-mail addresses. This full
   syntax is a superset of a minimal syntax which has been defined in
   [1].

1. Introduction

   The possible elements composing a "Global Switched Telephone Network
   (GSTN) address in e-mail" (also known as the Public Switched
   Telephone Network - PSTN) can vary from a minimum number up to a
   really large and complex collection. As noted the minimal format and
   general address syntax have been defined in [1], along with the
   mechanism needed to define additional address elements. This memo
   uses this extension mechanism to complete the syntax for representing
   GSTN addresses within e-mail addresses and contains the IANA
   registrations for all newly defined elements.

   In particular, the following additional address elements shall be
   defined:

   -  the detailed definition of GSTN number formats, in order to cover
      various alternative standard GSTN numbering schemes, (i.e. gstn-
      phone, sub-addr-spec and post-dial)





Allocchio                   Standards Track                     [Page 1]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   -  the message originator and/or recipient specification (pstn-
      recipient)

   GSTN addresses in e-mail MAY contain additional elements defined and
   registered in other specifications (see for example "T33S" element in
   [2]), but they MUST use definitions contained in this memo for those
   elements specified here.

   In particular, "service-selector" names and "qualif-type1" elements
   MUST be registered with IANA, and published within the "ASSIGNED
   NUMBERS" document. This provides a standard mechanism for extending
   the element sets and should avoid unnecessary duplication. IANA
   Registration form templates for the purpouse of registering new
   elements are provided in Appendix B. In addition the IANA
   consideration section of this document defines the procedures
   required to proceed with new registrations.

   A collection of forms for already defined "service-selector" and
   "qualif-type1" elements is listed in appendix C and appendix D
   respectively.

   In particular, efforts have been made to maintain compatibility with
   elements defined in existing e-mail gateway services and standard
   specifications. For example, to the extent possible, compatibility
   has been maintained with the MIXER [3] gateways specifications.

1.1 Relationship with Internet addressing other than e-mail

   Even if in this memo we focus on e-mail addresses, a number of
   elements defined in this specification can also be used for other
   specifications dealing with embedding GSTN addresses into other
   addresses: for example there is some work in progress about URLs
   specification which adopts similar definitions, with slight changes
   in the global syntax due to specific URL format.

1.2 Terminology and Syntax conventions

   In this document the formal definitions are described using ABNF
   syntax, as defined into [4]. We will also use some of the "CORE
   DEFINITIONS" defined in "APPENDIX A - CORE" of that document. The
   exact meaning of the capitalised words

   "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
   "SHOULD NOT", "RECOMMENDED",  "MAY", "OPTIONAL"

   is defined in reference [5].





Allocchio                   Standards Track                     [Page 2]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


2. GSTN extended number and pstn-mbox extended format

   In reference [1], section 2, the minimal definition of pstn-mbox
   includes the global-phone element, and further details are defined in
   [1] section 2.1.

   However other non global-phone numbering schemes are also possible.
   Thus, the minimal set syntax defined in [1] shall be extended to
   enable support for local-phone elements. Therefore, the gstn-phone
   format is defined as follows:

      gstn-phone = ( global-phone / local-phone )

   The complexity of the GSTN system includes also the optional use of
   subaddresses and post dialling sequences. As a consequence, there is
   a need to extend the definition of pstn-mbox per [1] to include
   support for both the minimal set definition and an extended syntax.

   The expanded definition of pstn-mbox is as follows:

      pstn-mbox = service-selector "=" global-phone

      pstn-mbox =/ service-selector "=" gstn-phone
                   [ sub-addr-spec ] [post-sep post-dial]

   NOTE: see section 4 in the event multiple "sub-addr-spec" elements
   per pstn-mbox need to be specified.

2.1 The local-phone syntax

   The local-phone element is intended to represent the set of possible
   cases where the global-phone numbering schema does not apply. Given
   the different and complex conventions currently being used in the
   GSTN system, the local-phone definition supports a large number of
   elements.

   The detailed syntax for local-phone elements follows:

      local-phone = [ exit-code ] [ dial-number ]

      exit-code = phone-string
                  ; this will include elements such as the digit to
                  ; access outside line, the long distance carrier
                  ; access code, the access password to the service,
                  ; etc...






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      dial-number = phone-string
                  ; this is in many cases composed of different elements
                  ; such as the local phone number, the area code
                  ; (if needed), the international country code
                  ; (if needed), etc...

   Note:
      the "+" character is reserved for use in global-phone addresses
      per [7] and MUST NOT be used as the starting character in a
      local-phone string.

      phone-string = 1*( DTMF / pause / tonewait / written-sep )

      DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )
                     ; special DTMF codes like "*", "#", "A", "B",
                     ; "C", "D" are defined in [6]
                     ; Important Note: these elements only apply for
                     ; alphabetic strings used in DTMF operations.
                     ; They are NOT applicable for the alphabetic
                     ; characters that are mapped to digits on phone
                     ; keypads in some countries.

      pause = "p"

      tonewait = "w"

   The written-sep element is defined in [1], section 2.1.

   Note:
      "pause" and "tonewait" character interpretation in local-phone
      numbers depends on the specific MTA implementation. Thus its exact
      meaning is not defined here. Both "pause" and "tonewait" are case
      insensitive.

   Important Note:
      A local-phone specification is a sequence which should be used
      only by the destination  MTA specified by mta-I-pstn (see [1],
      section 3). Per [12], other MTAs should transfer the message
      without modifying the LHS.

2.2 The sub-addr-spec element

   In GSTN service there are cases where a sub-addr-spec is required to
   specify the final destination. In particular there are ISDN
   subaddresses [7], which apply for various  services, whereas other
   subaddress types may be service specific (see the fax service T.33
   subaddress [8], [2]).




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   Within actual telephone operations there may be cases where different
   types of subaddresses are used as part of a single complete address.
   Therefore, the sub-addr-spec syntax definition which follows defines
   the subaddress element for the context of ISDN use; the T.33
   subaddress element is defined in [2], section 2.

   The definition of sub-addr-spec is:

      sub-addr-spec = [ isdn-sep isub-addr ]

   In detail:

      isdn-sep = "/ISUB="
                 ; note that "/ISUB=" is case INSENSITIVE

      isub-addr = 1*( DIGIT )

      isub-addr =/ 1*( DIGIT / written-sep )

   The IANA registration form for sub-addr-spec is given in appendix D.2

2.3 The post-sep and post-dial elements

   In some cases, after the connection with the destination GSTN device
   has been established, a further dialling sequence is required to
   access further services. A typical example is an automated menu-
   driven service using DTMF sequences. These cases may be handled using
   "post-sep" and "post-dial" elements as defined below:

      post-sep =  "/POSTD="
                  ; note that "/POSTD=" is case INSENSITIVE

      post-dial = phone-string

   The IANA registration form for post-sep and post-dial are given in
   appendix D.3

3. The pstn-recipient

   There are some application where it is valuable to supplement the
   pstn-mbox element with additional details. Common examples include
   the use of originator and/or recipient names and physical addresses,
   particularly in the context of onramp and/or offramp gateways.

   The optional pstn-recipient element provides support for such
   details.





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   As an example, when an offramp fax gateway is involved, the
   pstn-recipient element could be used to specify the intended
   recipient on a fax cover page, and the fax cover page headers could
   be qualified using the originator pstn-recipient information.

   In the interest of a compact syntax, the pstn-recipient element may
   be used to support both originator and recipient addresses. For all
   cases within the ABNF definitions to follow, the elements labelled
   with "recipient" may also be used for originator information.

   The pstn-recipient is a sequence of qualif-type1 elements as defined
   below:

      pstn-recipient = [ recipient-name ]
                       [ 1*( recipient-qualifier ) ]

   As a consequence, the extended definition of pstn-address becomes:

      pstn-address = pstn-mbox  [ qualif-type1 ]

      pstn-address =/ pstn-mbox [ pstn-recipient ] [ qualif-type1 ]


   The definition for  qualif-type1 elements is contained in [1] section
   2.

3.1 The recipient-name

   The recipient-name specifies the personal name of the originator
   and/or recipient:

      recipient-name = "/ATTN=" pers-name

      pers-name = [ givenname "." ]
                  [ initials "." ]
                  surname

   The following definitions come directly from the MIXER specification
   [3]:

      surname = printablestring

      givenname = 1*( DIGIT /  ALPHA / SP / "'" / "+" /
                    "," / "-" / "/" / ":" / "=" / "?" )

      initials = 1*ALPHA





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   Note:
      the "initials" element can specify the middle initial which is
      common in some countries; however it is also possible to support
      multiple initials, which may be commonly used in other countries.
      This allows the complete set of givennames initials in any
      possible combination. See examples at section 5.2

   It is essential to remember that the "pstn-address" element (in all
   its components and extensions) MUST strictly follow the "quoting
   rules" specified in the relevant e-mail standards [11], [12].

   The IANA registration form for recipient-name is given in appendix
   D.4.

3.2 The extensible recipient-qualifier

   The recipient-name is sometimes not enough to specify completely the
   originator and/or recipient. An additional set of optional elements,
   whose specific definition is in most cases application dependent, is
   thus defined:

      recipient-qualifier = ( qualif-type1 / qualif-type2 )

   The recipient-qualifier is a qualif-type1 element, and contains a
   qualif-type1 element in a recursive definition which allows an
   extensible format. The purpouse of qualif-type2 element is to permit
   additional extensibility for items which go beyond the scope of those
   defined for use with the qualif-type1 element.

   A series of qualif-type2 elements are defined below:

      qualif-type2 = "/" qual2-label "=" string

      qual2-label = "ORG" / "OFNO" / "OFNA" / "STR" / "ADDR"
                    "ADDU" / "ADDL" / "POB" / "ZIP" / "CO"

      string = PCHAR
               ; note that printable characters are %x20-7E

      printablestring = 1*( DIGIT / ALPHA / SP /
                            "'" / "(" / ")" / "+" / "," / "-" /
                            "." / "/" / ":" / "=" / "?" )
                        ; this definition comes from ITU F.401 [9]
                        ; and MIXER [3]







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   Table 1 includes short definition of qual2-label fields:

                        Table 1 - qual2-label

   qual2-label  Description
   -----------------------------------------------------------------
     "ORG"      Organization Name for Physical Delivery (example: ACME
                Inc)

     "OFNO"     Office Number for physical delivery (example: BLD2-44)

     "OFNA"     Office Name for physical delivery (example: Sales)

      "STR"     Street address for physical delivery (example:
                45, Main Street)

     "ADDR"     Unformatted postal address for physical delivery
                (example: HWY 14, Km 94.5 - Loc. Redhill)

     "ADDU"     Unique postal name for physical delivery (example:
                ACMETELEX)

     "ADDL"     Local postal attributes for physical delivery (example:
                Entrance 3, 3rd floor, Suite 296)

      "POB"     Post Office Box for physical delivery

      "ZIP"     Postal ZIP code for physical delivery

       "CO"     Country Name for physical delivery
   -----------------------------------------------------------------

   One or a combination of some of the above elements is usually enough
   to exactly specify the originator and/or recipient of the message.
   The use of a large number of these elements could in fact create a
   very long recipient-qualifier. Thus, only the strictly needed
   elements SHOULD be used. The maximum total length of the pstn-email
   MUST in fact not exceed the limits specified in the relevant e-mail
   standards [11] [12].

   IMPORTANT NOTE: Although the meaning of the above elements is derived
   directly from similar elements available in F.401 specification [9],
   the naming convention used in this document is explicitly different.
   In this way a conflict is avoided with related X.400 addressing
   rules.  Other specification which use the extension mechanism of this
   document to define new qualif-type1 elements which overlap with F.401
   are cautioned to create new labels which are different than those
   used in F.401.



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   The IANA registration form for these elements is given in appendix
   D.5 to D.14.

4. Multiple sub-addr-spec cases

   There are some instances in GSTN applications where multiple
   subaddresses are used: T.33 subaddresses in fax service are one of
   these cases. In e-mail practice a separate and unique e-mail address
   is always used for each recipient; as such, if multiple subaddresses
   are present, the use of multiple "pstn-email" elements [1] is
   REQUIRED.

   Implementors' note:
      The UA MAY accept multiple subaddress elements for the same
      global-phone, but it MUST generate multiple "pstn-mbox" elements
      when submitting the message to the MTA.

5. Examples

   In order to clarify the specification we present here a limited set
   of examples. Many of the examples refer to the fax service, but also
   additional possible services are included. Check also the examples in
   [1] and [2] for additional information. Please note that all the
   examples are for illustration purpouses, only.

5.1 pstn-mbox examples

   A pstn-mbox address in Italy for the fax service, dialled from
   U.S.A., using local-phone, without sub-addr-spec and without
   written-sep:

      FAX=0103940226338

   A pstn-mbox address in Germany for an hypothetical XYZ service, using
   global-phone, with ISDN sub-addr-spec 1234 and written-sep ".":

      XYZ=+49.81.7856345/ISUB=1234

   A pstn-mbox address in U.S.A. for fax service, using global-phone,
   with T.33 sub-addr-spec 8745, with written-sep "-" and post-dial
   sequence p1w7005393w373

      FAX=+1-202-455-7622/T33S=8745/PostD=p1w7005393w373

   A pstn-mbox address in Italy for fax service, using local-phone,
   dialed from an MTA in Germany, (international access code "00", with
   ISDN subaddress 9823, with T.33 subaddress "4312" and without pause
   or written-sep:



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      FAX=003940226338/Isub=9823/T33S=4312

   The same pstn-mbox address in Italy, using local-phone dialed from an
   MTA in Italy (long distance call), with long distant access "0", with
   exit-code "9", T.33 subaddress "4312", pause "p" and written-sep ".":

      FAX=9p040p22.63.38/t33s=4312

   A pstn-mbox address in North America for hypothetical service XYZ,
   using global-phone, without sub-addr-spec and written-sep "-" and
   ".":

      XYZ=+1.202.344-5723

   A pstn-mbox address for fax service in France, using local-phone
   dialed from an MTA in France (long distance call), with exit-code
   "0", T.33 subaddress "3345" and pause "p":

      FAX=0p0134782289/T33s=3345

   A pstn-mbox address for fax service in North America, using local-
   phone, without sub-addr-spec, without local-number, using only post-
   dial sequences to reach numbers stored in a locally defined short-
   dial numbers database, where 6743 is an access password, and 99p51 is
   the sequence to access the local short-dial number:

      FAX=/postd=w6743w99p51

5.2 pstn-recipient examples

   Here are a number of pstn-recipient examples. Please note that pstn-
   recipient is just an optional element, and thus a pstn-mbox element
   also is required in a pstn-address.

   A pstn-recipient using only recipient-name, with givenname initials
   and surname:

      /ATTN=Tom.J.Smiths

   A pstn-recipient using only recipient-name, with givenname, a
   complete set of initials (including the first name initial "C") and
   surname (where the "real life" givennames are "Carlo Maria Luis
   Santo" and the surname is "Nascimento"):

      /ATTN=Carlo.CMLS.Nascimento

   A pstn-recipient using only recipient-name, with givenname and
   surname:



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      /ATTN=Mark.Collins

   A pstn-recipient using only recipient-name, with surname only:

      /ATTN=Smiths

   A pstn-recipient using recipient-name, and one recipient-qualifier
   element:

      /ATTN=J.Smiths/OFNA=Quaility-control

   A pstn-recipient using two recipient-qualifier extension, only:

      /OFNO=T2-33A/OFNA=Quality-Ccontrol

   A fax-recipient using some recipient-qualifier for physical delivery:

      /STR=45, Main.Street/OFNA=Sales.dept

5.3 pstn-address examples

   Some pstn-address examples, obtained combining elements from previous
   examples. There are complete addresses which can be used as "local
   part" (LHS) element of an e-mail address.

   Without optional pstn-recipient (fax service):

      FAX=+12023445723

   With pstn-recipient (XYZ service):

      XYZ=+3940226338/ATTN=Mark.Collins

   With pstn-recipient made of two recipient-qualifier extensions (fax
   service):

      FAX=9p040p22.63.38/t33s=4312/ofno=T2-33A/OFNA=Q-C

5.4 pstn-email examples

   Here are the same addresses as before, where "faxgw" is the
   mta-I-pstn field for the fax service.

      FAX=+12023445723@faxgw

      FAX=+39-40-226338/ATTN=Mark.Collins@faxgw

      FAX=9p040p226338/T33S=4312/OFNO=T2-33A/OFNA=Q-C@faxgw



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      FAX=+39040226338/ATTN=Mark.Collins/@faxgw

   NOTE: the optional "/" in front for the "@" sign can be generated by
   gateways to other services, like MIXER [3].

5.5 A complete SMTP transaction example:

   Here is an example of complete SMTP transaction.

   S: <listening on SMTP port>
   C: <opens connection to SMTP port>
   S: 220 foo.domain.com ESMTP service ready
   C: EHLO pc.mailfax.com
   S: 250 foo.domain.com says hello
   C: MAIL FROM:<tom@mailfax.com>
   S: 250 <tom@mailfax.com> Sender ok
   C: RCPT TO:<FAX=+3940226338@foo.mailfax.com>
   S: 250 <FAX=+3940226338> recipient ok
   C: DATA
   S: 354 Enter your data
   C: From: Thomas Blake <tom@mailfax.com>
   C: To: Jim Burton <FAX=+3940226338@foo.mailfax.com>
   C: Subject: Hello there
   C: MIME-version: 1.0
   C: Date: Mon, 01 Sep 1997 18:14:23 -0700
   C: Content-Type: multipart/mixed; boundary=16820115-1435684603#2306
   C:
   C: This is a MIME message. It contains a
   C: TIFF fax bodypart
   C:
   C: --16820115-1435684603#2306
   C: Content-Type: image/TIFF
   C: Content-Transfer-Encoding: BASE64
   C: Content-Description: FAX
   C:
   C: ABAA745HDKLSW932ALSDL3ANCVSASDFLALSDFA
   C: 87AASS2999499ASDANASDF0000ASDFASDFNANN
   C: 87BBHDXBADS00288SADFNAZBZNNDNNSNNA11A0
   C: H8V73KS0C8JS6BFJEH78CDWWDUJEDF7JKES8==
   C: --16820115-1435684603#2306--
   C: .
   S: 250 Okay
   C: QUIT
   S: 221 Goodbye







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6. Conclusion

   This proposal creates a standard set of extensions for GSTN
   addresses, enriching the existing minimal specification [1]. The
   proposal is consistent with existing e-mail standards, but allows a
   more detailed GSTN address specification, including per originator
   and/or recipient specific elements. The IANA registration mechanism
   to permit the addition of new services and qualifiers using the GSTN
   addresses is also provided.

7. Security Considerations

   This document specifies a means by which GSTN addresses and more can
   be encoded into e-mail addresses. Since e-mail routing is determined
   by Domain Name System (DNS) data, a successful attack to DNS could
   disseminate tampered information, which causes e-mail messages to be
   diverted via some MTA or Gateway where the security of the software
   has been compromised.

   There are several means by which an attacker might be able to deliver
   incorrect mail routing information to a client. These include: (a)
   compromise of a DNS server, (b) generating a counterfeit response to
   a client's DNS query, (c) returning incorrect "additional
   information" in response to an unrelated query. Clients SHOULD ensure
   that mail routing are based only on authoritative answers. Once DNS
   Security mechanisms [7] become more widely deployed, clients SHOULD
   employ those mechanisms to verify the authenticity and integrity of
   mail routing records.

   Some GSTN service require dialing of private codes, like Personal
   Identification Numbers, to dial a G3 fax recipient or to access
   special services. As e-mail addresses are transmitted without
   encoding over the MTAs transport service, this could allow
   unauthorized people to gain access to these codes when used inside
   local-phone. More over these codes might appear in some cases in the
   originator and/or recipient addresses on cover pages delivered via
   offramp gateways to G3 fax recipients. Senders SHOULD be provided
   methods to prevent this disclosure, like code encryption, or
   masquerading techniques: out-of-band communication of authorization
   information or use of encrypted data in special fields are the
   available non-standard techniques.










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8. Appendix A: Collected ABNF Syntax

   In this section we provide a summary of ABNF specifications defining
   both the minimal [1] and the extended elements of pstn-address.

      pstn-email =  ["/"] pstn-address ["/"] "@" mta-I-pstn

      mta-I-pstn = domain

      pstn-address = pstn-mbox  [ qualif-type1 ]

      pstn-address =/ pstn-mbox [ pstn-recipient ] [ qualif-type1 ]

      pstn-mbox = service-selector "=" global-phone

      pstn-mbox =/ service-selector "=" gstn-phone
                   [ sub-addr-spec ] [post-sep post-dial]

      service-selector = 1*( DIGIT / ALPHA / "-" )

      qualif-type1 = "/" keyword "=" string

      keyword = 1*( DIGIT / ALPHA / "-" )

      string = PCHAR

      gstn-phone = ( global-phone / local-phone )

      global-phone = "+" 1*( DIGIT , written-sep )

      local-phone = [ exit-code ] [ dial-number ]

      exit-code = phone-string

      dial-number = phone-string

      phone-string = 1*( DTMF / pause / tonewait / written-sep )

      DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )

      written-sep = ( "-" / "." )

      pause = "p"

      tonewait = "w"

      sub-addr-spec = [ isdn-sep isub-addr ]




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      isdn-sep = "/ISUB="

      isub-addr = 1*( DIGIT )

      isub-addr =/ 1*( DIGIT / written-sep )

      post-sep =  "/POSTD="

      post-dial = phone-string

      pstn-recipient = [ recipient-name ]
                       [ 1*( recipient-qualifier ) ]

      recipient-name = "/ATTN=" pers-name

      pers-name = [ givenname "." ]
                  [ initials "." ]
                  surname

      surname = printablestring

      givenname = 1*( DIGIT /  ALPHA / SP / "'" / "+" /
                    "," / "-" / "/" / ":" / "=" / "?" )

      initials = 1*ALPHA

      recipient-qualifier = ( qualif-type1 / qualif-type2 )

      qualif-type2 = "/" qual2-label "=" string

      qual2-label = "ORG" / "OFNO" / "OFNA" / "STR" / "ADDR"
                    "ADDU" / "ADDL" / "POB" / "ZIP" / "CO"

      printablestring = 1*( DIGIT / ALPHA / SP /
                            "'" / "(" / ")" / "+" / "," / "-" /
                            "." / "/" / ":" / "=" / "?" )

10. Appendix B: IANA Considerations

   As the service-selector and qualif-type1 elements values are
   extensible ones, they MUST be registered with IANA.

   To register a service-selector or a qualif-type1 element, the
   registration form templates given in B.1 and B.2 MUST be used. Any
   new registration MUST fulfill the "Specification Required" criterion,
   as defined in RFC 2434, section 2 [13]:





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      "Specification Required - Values and their meaning MUST be
       documented in an RFC or other permanent and readily available
       reference, in sufficient detail so that interoperability
       between independent implementations is possible."

   IANA MUST NOT accept registrations which are not supplemented by a
   Specification as defined above and which are not fully specified
   according to the template forms given in B.1 and B.2. In case of need
   for further consultation about accepting a new registration, IANA
   SHOULD refer to the Application Area Director to be directed to the
   appropriate "expert" individual or IETF Working Group.

   After successful registration, IANA should publish the registered new
   element in the appropriate on-line IANA WEB site, and include it into
   the updates of the "Assigned Numbers" RFC series.

   B.1: IANA Registration form template for new values of GSTN address
   service-selector

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            service-selector specifier "foo"

   service-selector name:

      foo

   Description of Use:

      foo - ("foo" is a fictional new service-selector used in this
      template as an example, it is to be replaced with the new value
      being registered. Include a short description of the use of the
      new value here. This MUST include reference to Standard Track RFCs
      and eventually to other Standard Bodies documents for the complete
      description;  the use of the value must be defined completely
      enough for independent implementation).

   Security Considerations:

      (Any additional security considerations that may be introduced by
      use of the new service-selector parameter should be defined here
      or in the reference Standards Track RFCs)

   Person & email address to contact for further information:

      (fill in contact information)





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   INFORMATION TO THE SUBMITTER:

   The accepted registrations will be listed in the "Assigned Numbers"
   series of RFCs.  The information in the registration form is freely
   distributable.

   B.2: IANA Registration form template for new values of GSTN
   address qualif-type1 keyword and value

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "bar"

   qualif-type1 "keyword" name:

      bar

   qualif-type1 "value" ABNF definition:

      abnf - ("abnf" MUST define the ABNF form of the qualif-type1 value.
      The ABNF specification MUST be self-contained, using as basic
      elements the tokens given in specification [4]. To avoid any
      duplication (when appropriate), it MUST also use as building
      non-basic tokens any already registered non-basic token from other
      qualif-type1 elements, i.e. it MUST use the same non-basic token
      name and then repeat its identical ABNF definition from basic
      tokens; see appendix E for examples).

   Description of Use:

      bar - ("bar" is a fictional description for a new qualif-type1
      element used in this template as an example. It is to be replaced
      by the real description of qualif-type1 element being registered.
      Include a short description of the use of the new qualif-type1
      here. This MUST include reference to Standards Track RFCs and
      eventually to other Standard Bodies documents for the complete
      description; the use of the value MUST be defined completely
      enough for independent implementation.)

   Use Restriction:

      (If the new qualif-type1 elements is meaningful only for a
      specific set of service-element, you MUST specify here the list of
      allowed service-element types. If there is no restriction, then
      specify the keyword "none")






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   Security Considerations:

      (Any additional security considerations that may be introduced by
      use of the new service-selector parameter should be defined here
      or in the reference Standards Track RFCs)

   Person & email address to contact for further information:

      (fill in contact information)

   INFORMATION TO THE SUBMITTER:

   The accepted registrations will be listed in the "Assigned Numbers"
   series of RFCs.  The information in the registration form is freely
   distributable.

11. Appendix C: IANA Registration form for new value of GSTN
    address service-selector "FAX"

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            service-selector specifier "FAX"

   service-selector name:

      FAX

   Description of Use:

      FAX - specify that the GSTN address refers either to an
      Internet Fax device, or an onramp/offramp Fax gateway.

      For a complete description refer to RFC 2304 and RFC 2303

   Security Considerations:

      See the Security Consideration section of RFC 2304.

   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy





Allocchio                   Standards Track                    [Page 18]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

12. Appendix D: IANA Registration forms for new values of GSTN
       address qualit-type1 keyword and value

   D.1 - T33S

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "T33S"

   qualif-type1 "keyword" name:

      T33S

   qualif-type1 "value" ABNF definition:

      sub-addr = 1*( DIGIT )

   Description of Use:

      T33S is used to specify the numeric only optional fax sub-address
      element described in "ITU T.33 - Facsimile routing utilizing the
      subaddress; recommendation T.33 (July, 1996)". Further detailed
      description is available in RFC 2304.

   Use Restriction:

      The use of "T33S" is restricted to "FAX" service-selector, is it
      has no meaning outside the fax service.

   Security Considerations:

      See the Security Consideration section of RFC 2304.

   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy




Allocchio                   Standards Track                    [Page 19]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.2 - ISUB

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ISUB"

   qualif-type1 "keyword" name:

      ISUB

   qualif-type1 "value" ABNF definition:

      isub-addr = 1*( DIGIT )

      isub-addr =/ 1*( DIGIT / written-sep )

      written-sep = ( "-" / "." )

   Description of Use:

      "ISUB" is used to specify the optional ISDN sub-address elements used
      in ISDN service to reach specific objects on the ISDN service. It can
      eventually embed written separator elements for the only scope to
      enhance human readability. See RFC 2846 for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.













Allocchio                   Standards Track                    [Page 20]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.3 - POSTD

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "POSTD"

   qualif-type1 "keyword" name:

      POSTD

   qualif-type1 "value" ABNF definition:

      phone-string = 1*( DTMF / pause / tonewait / written-sep )

      DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )

      pause = "p"

      tonewait = "w"

      written-sep = ( "-" / "." )

   Description of Use:

      POSTD is the optional further dialling sequence needed to access
      additional services (for example a menu' driven interface)
      available after the service site has been accessed using
      gstn-phone. See RFC 2846 for further details.








Allocchio                   Standards Track                    [Page 21]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.

   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.4 - ATTN

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ATTN"

   qualif-type1 "keyword" name:

      ATTN

   qualif-type1 "value" ABNF definition:

      pers-name = [ givenname "." ] [ initials "." ] surname

      surname = printablestring

      givenname = 1*( DIGIT /  ALPHA / SP / "'" / "+" /
                    "," / "-" / "/" / ":" / "=" / "?" )

      initials = 1*ALPHA

      printablestring = 1*( DIGIT / ALPHA / SP /
                            "'" / "(" / ")" / "+" / "," / "-" /
                            "." / "/" / ":" / "=" / "?" )




Allocchio                   Standards Track                    [Page 22]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Description of Use:

      To specify the personal name of the individual intended as the
      originator or the recipient of the message. See RFC 2846 for
      further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.

   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.5 - ORG

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ORG"

   qualif-type1 "keyword" name:

      ORG

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Organization Name (example: ACME Inc.) See RFC 2846
      for further details.




Allocchio                   Standards Track                    [Page 23]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.

   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.6 - OFNO

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "OFNO"

   qualif-type1 "keyword" name:

      OFNO

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Office Number (example: BLD2-44) See RFC 2846
      for further details.

   Use Restriction:

      none.






Allocchio                   Standards Track                    [Page 24]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Security Considerations:

      See the Security Consideration section of RFC 2846.

   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.7 - OFNA

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "OFNA"

   qualif-type1 "keyword" name:

      OFNA

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Office Name (example: Sales) See RFC 2846
      for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.






Allocchio                   Standards Track                    [Page 25]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.8 - STR

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "STR"

   qualif-type1 "keyword" name:

      STR

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Street Address (example: 45, Main Street).
      See RFC 2846 for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 26]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.9 - ADDR

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ADDR"

   qualif-type1 "keyword" name:

      ADDR

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Unformatted Postal Address (example: HWY 14,
      Km 94.5 - Loc. Redhill). See RFC 2846 for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 27]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.10 - ADDU

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ADDU"

   qualif-type1 "keyword" name:

      ADDU

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Unique Postal Name (example: ACMETELEX). See
      RFC 2846 for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 28]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.11 - ADDL

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ADDL"

   qualif-type1 "keyword" name:

      ADDL

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Local Postal Attributes (example: Entrance 3,
      3rd floor, Suite 296). See RFC 2846 for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 29]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.12 - POB

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "POB"

   qualif-type1 "keyword" name:

      POB

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Post Office Box (example: CP 1374). See RFC 2846
      for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 30]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.13 - ZIP

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "ZIP"

   qualif-type1 "keyword" name:

      ZIP

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify Postal ZIP code (example: I 34012). See RFC 2846
      for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 31]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

   D.14 - CO

   To: IANA@isi.edu
   Subject: Registration of new values for the GSTN address
            qualif-type1 element "CO"

   qualif-type1 "keyword" name:

      CO

   qualif-type1 "value" ABNF definition:

      string = PCHAR

   Description of Use:

      To specify the Country Name (example: Belgium) See RFC 2846
      for further details.

   Use Restriction:

      none.

   Security Considerations:

      See the Security Consideration section of RFC 2846.










Allocchio                   Standards Track                    [Page 32]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   Person & email address to contact for further information:

      Claudio Allocchio
      INFN-GARR
      c/o Sincrotrone Trieste
      SS 14 Km 163.5 Basovizza
      I 34012 Trieste
      Italy

      RFC822: Claudio.Allocchio@elettra.trieste.it
      X.400:  C=it;A=garr;P=Trieste;O=Elettra;
              S=Allocchio;G=Claudio;
      Phone:  +39 040 3758523
      Fax:    +39 040 3758565

13. Author's Address

   Claudio Allocchio
   INFN-GARR
   c/o Sincrotrone Trieste
   SS 14 Km 163.5 Basovizza
   I 34012 Trieste
   Italy

   RFC822: Claudio.Allocchio@elettra.trieste.it
   X.400:  C=it;A=garr;P=Trieste;O=Elettra;
           S=Allocchio;G=Claudio;
   Phone:  +39 040 3758523
   Fax:    +39 040 3758565

14. References

   [1]  Allocchio, C., "Minimal PSTN address format in Internet Mail",
        RFC 2303, March 1998.

   [2]  Allocchio, C., "Minimal FAX address format in Internet Mail",
        RFC 2304, March 1998.

   [3]  Kille, S., "MIXER (Mime Internet X.400 Enhanced Relay): Mapping
        between X.400 and RFC 822/MIME", RFC 2156, January 1998.

   [4]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
        Specifications", RFC 2234, November 1997.

   [5]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.





Allocchio                   Standards Track                    [Page 33]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


   [6]  ETSI I-ETS 300,380 - Universal Personal Telecommunication (UPT):
        Access Devices Dual Tone Multi Frequency (DTMF) sender for
        acoustical coupling to the microphone of a handset telephone
        (March 1995)

   [7]  ITU E.164 - The International Public Telecommunication Numbering
        Plan E.164/I.331 (May 1997)

   [8]  ITU T.33 - Facsimile routing utilizing the subaddress;
        recommendation T.33 (July, 1996)

   [9]  ITU F.401 - Message Handling Services: Naming and Addressing for
        Public Massage Handling Service; recommendation F.401 (August
        1992)

   [10] ITU F.423 - Message Handling Services: Intercommunication
        Between the Interpersonal Messaging Service and the Telefax
        Service; recommendation F.423 (August 1992)

   [11] Crocker, D., "Standard for the format of ARPA Internet text
        messages", STD 11, RFC 822, August 1982.

   [12] Braden, R., "Requirements for Internet hosts - application and
        support", STD 3, RFC 1123, October 1989.

   [13] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA
        Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.
























Allocchio                   Standards Track                    [Page 34]

RFC 2846       GSTN Address Extensions in E-mail Services      June 2000


15. Full Copyright Statement

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS 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.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















Allocchio                   Standards Track                    [Page 35]