Please check this thread. The CANCEL will get a 2xx response. https://lists.cs.columbia.edu/pipermail/sip-implementors/2006-May/012974.html
On 5/25/06, Nataraju A B <[EMAIL PROTECTED]> wrote: > > > Thanks & Regards, > Nataraju A.B. > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Madhuri > Sakhare > Sent: Thursday, May 25, 2006 7:40 PM > To: [email protected] > Subject: [Sip-implementors] Query Regarding Collision case of CANCEL. > > Hi, > > > Consider this call flow: > > UAC UAS > > | INVITE | > > |----------------------->| > > | 180 RINGING | > > |<-----------------------| > > | CANCEL | > > |----------------------->| > > | 200 OK CANCEL | > > |<-----------------------| > > | | > > > This is a collision case of a reliable 180 response and a CANCEL > Request. The application on the callee side has sent a 200 OK response, > and the response is left pending in the SIP stack. Then the collision > occurs and the CANCEL is indicated to the application, but since it has > already sent a final response, it has no way of sending another one. The > call is not freed. > > How should the SIP stack responds to this? > [ABN] This scenario has been discussed in the list quite a few times... > if the callee UA had already sent 200OK for INVITE then 200OK will not > be sent for CANCEL. CANCEL would be rejected with 481 responses... > > The call will go through... > > The caller's SIP stack has to initiate the BYE request to terminate the > call once the INV/200/ACK transaction is completed... if the user had > hung up the call... > > Regards, > Madhuri > > > > > > > > > > > > > > > > > > _______________________________________________ > 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 > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
