Minutes of the S2 meeting #14 4th to 8th of September 2000 Bristol, uk

4.2.2Ungraceful session termination in the IM domain

S2-001436 from Telia: Ungraceful session termination in the IM domain

It is proposed to mandate the use SIP session timer by S-CSCF and UE to enable the detection of “ungraceful” session termination.

Discussion: Lucent also mentioned that this is a N1 matter. But the requirement is an S2 task.

When the timer expires, the end point considers that the session is terminated, and its behaviour is not specified.

Conclusion: The requirements are expressed in S2-001602, and a LS to N1 is proposed in S2-001603.
S2-001602 from Telia: Requirement for handling ungraceful session termination in the IM domain

Revision of S2-001436. In essence, this tdoc is saying that to ensure stable S-CSCF operation and carrier grade service, a mechanism to handle the ungraceful session termination issue is required. This mechanism should be at the SIP protocol level in order to guarantee access independence for the IM domain

Discussion: Some discussions on whether “shall” would not be more appropriate than “should”.

The place in 23.228 has to be decided by the editor.