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Liaison Statement: LS on offer/answer procedures

Submission Date: 2008-04-21
From: 3GPP (Susanna Kooistra)
To: IETF MMUSIC WG,IETF SIPPING WG (gonzalo.camarillo@ericsson.com, jf.mule@cablelabs.com)
Cc:hannu.hietalahti@nokia.com
Response Contact:
Technical Contact:
Purpose: For action
Deadline: 2008-05-09 Action Taken
Attachments: LS on offer/answer procedures
Body:
3GPP TSG CT WG1 Meeting #52	C1-081428
Jeju Island, KOREA, 7th – 11th April 2008

Title:	LS on offer/answer procedures
Response to:	-
Release:	-
Work Item:	-

Source:	CT1
To:	IETF SIPPING WG
Cc:	IETF MMUSIC WG
Cc:	3GPP/IETF and 3GPP/ITU-T Co-ordinator
Hannu HIETALAHTI (3GPP TSG CT Chair (hannu.hietalahti@nokia.com)
Contact Person:	
Name:	Christer HOLMBERG
E-mail Address:	christer.holmberg@ericsson.com

Attachments:	None


1. Overall Description:

3GPP CT1 has discussed the "Commit/Rollback of Offer/Answer on
Unsuccessful re-INVITE Transaction" issue in
draft-ietf-sipping-sip-offeranswer-06.txt.

A typical example of where subsequent offer/answer transactions may
take place before a final answer to the re-INVITE request is received
is when new media streams are added during an ongoing session, and
those media streams require pre-condition procedures due to
network/radio resource reasons. 

CT1 has identified the importance of a solution to the matter, in order
to specify and implement interoperable procedures, and to avoid SDP
state misalignments in cases where re-INVITE requests are rejected.

CT1 aims to be able to find a solution to the issue within the 3GPP
Release 8 timeframe, which is scheduled to be frozen in December 2008.

2. Actions:
To IETF SIPPING WG
ACTION: 	CT1 asks SIPPING to take the importance of the issue into
considerations in their work, and to provide guidance how to proceed on
the matter.

3. Date of Next CT1 Meetings:
TITLE 	DATES 	LOCATION 	CTRY 
3GPPCT1#52 
7 - 11 Apr 2008    	Jeju Island  	KR  
3GPPCT1#53 
5 - 9 May 2008    	Cape Town  	ZA  
3GPPCT1#54 
23 - 27 Jun 2008    	Zagreb  	HR  
3GPPCT1#55 
18 - 22 Aug 2008    	Budapest  	HU  
3GPPCT1#56 
10 - 14 Nov 2008    	Shanghai  	CN