Technical Summary
This specification creates a new, predefined value (380)
for the "cause" URI parameter, defined in RFC 4458, to
indicate that service number translation, in which a
service access number has been retargeted due to specific
service action, has occurred.
Working Group Summary
Versions -00, -01, and -02 received feedback on the
Dispatch mailing list. At IETF 92, the Dispatch chairs
proposed to progress the draft as individual/AD sponsored,
and no objections were raised.
With the earliest drafts, there was some confusion among
discussion participants about which "cause" parameter was
being updated since SIP has both a "cause" URI parameter
and a "cause" header field parameter that is used with the
Reason header field. Which "cause" parameter the document
impacts is clarified in section 2.1 of the draft.
Some history on RFC type: RFC 4458, since it registers
the "cause" URI parameter, probably should have been
standards track, but at the time of publication, RFC 3969
was not consistent in specifying that Standards Action
was required for the registration of SIP URI parameters
(RFC 5727 clarifies this). The minutes for the SIP WG,
IETF 60, show that there was consensus to progress
draft-jennings-sip-voicemail-uri (RFC 4458) as an
individual submission to Informational, which is the
path that RFC 4458 took. If the contents of RFC 4458
were to be proposed today, that document would need
to be standards track.
After much discussion between the IESG, the ART AD,
the SIPcore and Dispatch chairs about updating
RFC 4458 to be standards track and progressing
draft-mohali-dispatch-service-number-translation
as standards track, it was decided to leave them as is.
The "cause" URI parameter is not intended for general use
across the internet. draft-mohali-dispatch-service-number-translation
does not register a URI parameter; it just adds a reference
to an existing registration. The decision to keep these
documents informational is not intended to set precedent;
RFC 5727 remains the BCP for the SIP change process.
Document Quality
3GPP will be rolling this update out with Release 13,
so there will be multiple implementations of this document.
An expert review was not required for this document.
The document's Acknowledgments section thanks reviewers
who had significant feedback.
Personnel
Document Shepherd: Jean Mahoney
Responsible Area Director: Ben Campbell
RFC Editor Note
RFC Editor Note
Please move the reference for [RFC4458] from the informative reference section to the normative reference section.