Minimal FAX address format in Internet Mail (RFC3192)
Original Publication Date: 2001-Oct-01
Included in the Prior Art Database: 2001-Nov-14
Internet Society Requests For Comment (RFCs)
This memo describes a simple method of encoding Global Switched Telephone Network (GSTN) addresses of facsimile devices in the local-part of Internet email addresses.
Network Working Group C. Allocchio
Request for Comments: 3192 GARR-Italy
Obsoletes: 2304 October 2001
Category: Standards Track
Minimal FAX 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 (C) The Internet Society (2001). All Rights Reserved.
This memo describes a simple method of encoding Global Switched
Telephone Network (GSTN) addresses of facsimile devices in the
local-part of Internet email addresses.
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
Since the very first e-mail to fax gateway objects appeared, a number
of different methods to specify a fax 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 send and
receive faxes from his/her e-mail interface, to allow some kind of
"fax over e-mail service" transport (possibly reducing the costs of
GSTN long distance transmissions) while using the existing e-mail
This memo describes the MINIMAL addressing method and standard
extensions to encode FAX addresses into e-mail addresses, as required
in reference . The opposite problem, i.e., to allow a
traditional numeric-only fax device user to access the e-mail
transport service, is not discussed here.
Allocchio Standards Track [Page 1]
RFC 3192 Minimal FAX address format in Internet Mail October 2001
These IANA forms used to register the standard elements defined here
are given in the "IANA Considerations" chapter (section 7 of this
All implementations supporting FAX over e-mail address format MUST
support this minimal specification.
1.1 Terminology and Syntax conventions
In this document the formal definitions are described using ABNF
syntax, as defined into . We will also use 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 .
In this document the following new terms are also defined:
an I-pstn device type  which is able to communicate either
directly or indirectly with the traditional FAX over GSTN
the Internet domain name which identifies uniquely an I-fax
device over the Internet (see also mta-I-pstn in );
the complete Internet e-mail address structure which is used to
transport a FAX...