RFC 3191 (rfc3191) - Page 2 of 13

Minimal GSTN address format in Internet Mail

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

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

   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
         network;

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

      pstn-email:
         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:





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