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.
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