RFC 2304 (rfc2304) - Page 2 of 8
Minimal FAX address format in Internet Mail
Alternative Format: Original Text Document
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
Allocchio Standards Track