-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of I?aki Baz Castillo Sent: Thursday, August 14, 2008 4:08 PM To: [email protected] Subject: Re: [Sip-implementors] About CANCEL proccesing in a UAS
El Thursday 14 August 2008 05:44:42 Rockson Li (zhengyli) escribió: > > 2) - UAS receives a CANCEL for an INVITE transaction for which UAS > > has already sent a final response. In this case RFC3261 says: > > > > "the CANCEL > > request has no effect on the processing of the original request, no > > effect on any session state, and no effect on the responses generated > > for the original request." > > > > - But should UAS reply a 4XX? > [RL] since INVITE server transaction would be terminated on delivery > of 2xx, so I think CANCEL cannot match any to-be-cancelled > transaction, so 481 would be sent. But what about if the final response was [3456]XX ? [RL] again 200(CANCEL) is sent, since server transaction is matched, this is the only criteria in spec, nothing to do the final resp UAS sent. > However, draft-sparks-sip-invfix intends change INVITE trasanction , > so I think 200(CANCEL) will be sent after this draft is accepted to > update RFC3261. Thanks, I must re-read it. > 3) UAS receives a CANCEL that matches an active NON-INVITE > transaction. RFC > says: > > "A CANCEL request has no impact on the processing of > transactions with any other method defined in this specification > (INVITE)". > > - Which response should UAS sent? a 481? a 400? > [RL] I think 200(CANCEL) will be sent since rfc says > > "Regardless of the method of the original request, as long as the > CANCEL matched an existing transaction, the UAS answers the CANCEL > request itself with a 200 (OK) response. " > > 200 only means CANCEL is reached at UAS, it does not mean anything > previous transaction would be cancelled. We can send 200 for > acknowledge CANCEL, but continue processing non-INVITE req without any impact. Ok. Thanks a lot. -- Iñaki Baz Castillo [EMAIL PROTECTED] _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
