Minimal GSTN address format in Internet Mail
RFC 3191

Document Type RFC - Draft Standard (October 2001; No errata)
Obsoletes RFC 2303
Updates RFC 2846
Last updated 2013-03-02
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IESG IESG state RFC 3191 (Draft Standard)
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Network Working Group                                       C. Allocchio
Request for Comments: 3191                                    GARR-Italy
Obsoletes: 2303                                             October 2001
Updates: 2846
Category: Standards Track

              Minimal GSTN address format in Internet Mail

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 (2001).  All Rights Reserved.


   This memo describes a simple method of encoding Global Switched
   Telephone Network (GSTN) addresses (commonly called "telephone
   numbers") in the local-part of Internet email addresses, along with
   an extension mechanism to allow encoding of additional standard
   attributes needed for email gateways to GSTN-based services.

1. Introduction

   As with all Internet mail addresses, the left-hand-side (local-part)
   of an address generated according to this specification, is not to be
   interpreted except by an MTA that handles messages for the domain
   given in the right-hand-side.

   Since the very first e-mail to GSTN services gateway appeared, a
   number of different methods to specify a GSTN address as an e-mail
   address have been used by implementors.  Several objectives for this
   methods have been identified, like to enable an e-mail user to access
   GSTN services from his/her e-mail interface, to allow some kind of
   "GSTN over e-mail service" transport (possibly reducing the costs of
   GSTN long distance transmissions) while using the existing e-mail

Allocchio                   Standards Track                     [Page 1]
RFC 3191      Minimal GSTN address format in Internet Mail  October 2001

   This memo describes the MINIMAL addressing method to encode GSTN
   addresses into e-mail addresses and the standard extension mechanism
   to allow definition of further standard elements.  The opposite
   problem, i.e., to allow a traditional numeric-only GSTN device user
   to access the e-mail transport service, is not discussed here.

   The IANA registration templates which MUST be used to register any
   standard element defined according to this specification are given in
   the "IANA Considerations" chapter (section 7 of this document).

   All implementations supporting this GSTN over e-mail service MUST
   support as a minimum the specification described in this document.
   The generic complex case of converting the entirety of GTSN
   addressing into e-mail is out of scope in this minimal specification.

1.1 Terminology and Syntax conventions

   In this document the formal definitions are described using ABNF
   syntax, as defined into [7].  This memo also uses some of the "CORE
   DEFINITIONS" defined in "APPENDIX A - CORE" of that document.  The
   exact meaning of the capitalized words


   is defined in reference [6].

   In this document the following new terms are also defined:

      I-pstn device:
         a device which has an Internet domain name and it is able to
         communicate either directly or indirectly with the GSTN

         the Internet domain name which identifies uniquely an I-pstn
         device over the Internet;

         the complete Internet e-mail address structure which is used to
         transport a GSTN address over the Internet e-mail service.

2. Minimal GSTN address

   The minimal specification of a GSTN address within an e-mail address
   is as follows:

Allocchio                   Standards Track                     [Page 2]
RFC 3191      Minimal GSTN address format in Internet Mail  October 2001

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

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

      service-selector = 1*( DIGIT / ALPHA / "-" )
                         ; note that SP (space) is not allowed in
                         ; service-selector.
                         ; service-selector MUST be handled as a case
                         ; INSENSITIVE string by implementations.

   Other specifications adopting the "pstn-address" definition MUST
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