RFC 2303 (rfc2303) - Page 2 of 8
Minimal PSTN address format in Internet Mail
Alternative Format: Original Text Document
RFC 2303 Minimal PSTN in Internet Mail March 1998
This memo describes the MINIMAL addressing method to encode PSTN
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 PSTN device user to
access the e-mail transport service, is not discussed here.
All implementations supporting this PSTN over e-mail service MUST
support as a minimum the specification described in this document.
The generic complex case of converting the whole PSTN addressing into
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 PSTN address
The minimal specification of a PSTN address in e-mail address is as
follows:
pstn-address = pstn-mbox [ qualif-type1 ]
pstn-mbox = service-selector "=" global-phone
service-selector = 1*( DIGIT / ALPHA / "-" )
; note that SP (space) is not allowed in
; service-selector.
; service-selector MUST be handled as a case
; INSENSITIVE string by implementations.
Specifications adopting the "pstn-address" definition MUST define a
unique case insensitive "service-selector" element to identify the
specific messaging service involved.
These specifications MUST also define which minimal "qualif-type1"
extensions, if any, MUST be supported for the specified service.
Implementations confirming to these minimal requirements
specification are allowed to ingnore any other non-minimal extensions
address element which can be present in the "pstn-address". However,
Allocchio Standards Track