On 04/18/2011 05:26 AM, Chandan Kumar wrote: > small Query regarding a CANCEL request. Say make call from UA to UAS via > proxy(B2BUA) ,before UAS accepts the call .
Proxies and B2BUAs are very, very different. > 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. Is the device you are calling 'proxy' an actual proxy, or a B2BUA? The expected behavior could differ substantially based on that. -- Kevin P. Fleming Digium, Inc. | Director of Software Technologies Jabber: [email protected] | SIP: [email protected] | Skype: kpfleming 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at www.digium.com & www.asterisk.org _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
