RFC 2304 (rfc2304) - Page 2 of 8

Minimal FAX address format in Internet Mail

RFC 2304               Minimal FAX address format             March 1998


   This memo describes the MINIMAL addressing method and standard
   extensions to encode FAX addresses in e-mail addresses, as required
   in reference [13]. 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.

   All implementations supporting this FAX over e-mail address format
   MUST support as a minimum the specification described in this
   document.  The generic complex case of converting the whole PSTN
   addressing in e-mail is out of scope in this minimal specification:
   there is some work in progress in the field, where also a number of
   standard optional extensions are being defined.

   In this document the formal definitions are described using ABNF
   syntax, as defined into [7]. 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 [6].

2. Minimal Fax address

   The "service-selector" defined in section 2 of reference [13] for the
   fax service is:

      service-selector = "FAX"

   The minimal addressing for the fax service also requires support for
   a "qualif-type1" element (see section 2 of reference [13]).  This
   element is an OPTIONAL element of the fax address, but its support,
   when present, is REQUIRED:

      qualif-type1 = "/" t33-sep "=" sub-addr

   where

      t33-sep = "T33S"

      sub-addr = 1*( DIGIT )

   Thus, the minimal specification of a fax in e-mail address is:

      fax-address = fax-mbox [ "/T33S=" sub-addr ]

      fax-mbox = "FAX=" global-phone



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