You mean the method type is CANCEL in CSeq ? Why ? But anyways since there is no final response for INVITE, the following section of 3261 holds --- Rosenberg, et. al. Standards Track [Page 54] If there is no final response for the original request in 64*T1 seconds (T1 is defined in Section 17.1.1.1), the client SHOULD then consider the original transaction cancelled and SHOULD destroy the client transaction handling the original request. Regards, Harbhanu
*************************************************************************************** This e-mail and attachments contain confidential information from HUAWEI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient's) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it! ________________________________________ From: [email protected] [[email protected]] on behalf of Chandan Kumar [[email protected]] Sent: 18 April 2011 15:56:45 To: [email protected] Subject: [Sip-implementors] Sip CANCEL call Hi , small Query regarding a CANCEL request. Say make call from UA to UAS via proxy(B2BUA) ,before UAS accepts the call . 1.UA cancels the request. proxy responds with 200 Ok . 2.Proxy sends CANCEL to UAS & uAS respond with 200 ok. 3.UAS sends 487 to proxy & proxy send ACK . 4.But proxy sends 487 request termination to UA with Cseq header as CANCEL (which should be INVITE) .So UA waits for a while re sends CANCEL request. proxy responds with 481 call/transaction leg doesn't request. Now my question regarding 4th point ,As UA didnt receive 487 request for with Cseq header as NVITE ,is it right UA sending CANCEL request for the second time. Please can some one clarify on this ,Iam new to SIP so little confused. thanks in advance. Best Regards, Ckumar. _______________________________________________ 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
