[dispatch] Charter proposal: SIP Alert-Info URN

<L.Liess@telekom.de> Mon, 21 September 2009 17:44 UTC

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Thread-Topic: Charter proposal: SIP Alert-Info URN
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From: L.Liess@telekom.de
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Subject: [dispatch] Charter proposal: SIP Alert-Info URN
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Hello,

Please find below our charter proposal for the SIP Alert-Info URN.

Comments are very welcome!

Kind regards,
Laura 



The SIP Alert-Info URN (SAIU) working group is chartered to define a new
URN-scheme which allows SIP to convey a particular alert indication
using a name instead of a referenced URI. The Alert-Info URN solves
interoperability problems which we encounter today around the use of the
Alert-Info header field for services as call waiting, call forwarding,
blind transfer, automatic callback, call hold or emergency announcements
sent over PBX systems.    

RFC 3261 allows a UAS or proxy to provide a specific ring-/ringback-tone
as a reference (e.g. HTTP URI) which can be played to the user in the
Alert-Info header. 
This mechanism does not ensure interoperability on the semantic level
when there is no common understanding of the referenced content
(different countries, hearing impaired) or when the user has his own
tones configured in the end device. There are a variety of URI
conventions and proprietary Alert-Info header field parameters to
provide this today, all of which are non-interoperable.  A standardized
set of Alert-Info URNs will increase SIP interoperability for this
header field by replacing proprietary conventions.

The group will produce:

- A specification which describes the problem statement, the Alert-Info
URN-scheme and defines the specific Alert-Info URNs identifiers to solve
the known service interoperability problems. 

Goals and Milestones
====================

Dec 10 - Alert-Info URN specification to IESG (PS)