RFC 2303 (rfc2303) - Page 1 of 8

Minimal PSTN address format in Internet Mail

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Network Working Group                                      C. Allocchio
Request for Comments: 2303                                   GARR-Italy
Category: Standards Track                                    March 1998




              Minimal PSTN 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 (1998).  All Rights Reserved.

IESG NOTE

   This memo describes a simple method of encoding PSTN addresses 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 PSTN-based services.

   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 the MTA that is named on the right-hand-side
   (domain).

1. Introduction

   Since the very first e-mail to PSTN services gateway appeared, a
   number of different methods to specify a PSTN address as an e-mail
   address have been used by implementors. Two major objectives for this
   were

     - enable an e-mail user to access these services from his/her
       e-mail interface;

     - enable some kind of "PSTN over e-mail service" transport, to
       reduce the costs of PSTN long distance transmissions, and use the
       existing e-mail infrastructure.




Allocchio                   Standards Track
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