Step 2 is inconsistent with the RFC. The UAC MUST wait for a 100 trying before sending a CANCEL.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chacoo Sent: Monday, January 08, 2007 4:55 PM To: [email protected] Subject: [Sip-implementors] Question on CANCEL Hi I have some question on following scenario. 1. Alice send INVITE to Bob. 2. Before receiving any message, Alice terminated the call. In the other word, it send CANCEL to Bob. 3. Because of using UDP or some other reasons, Bob receives CANCEL before INVITE. 4. Bob send 481 for CANCEL, and then process INVITE, 180 or 200 will be sent. 5. Alice receive 481, then cease retransmission of CANCEL. After that Alice receive 180 or 200. Q1. Now what should be taken to inform Bob to cease the retransmission, or just let it be? Q2. The other reason in 3 may be that the retransmission of INVITE cannot ceased by sending CANCEL. So can the INVITE transaction be ceased by sending CANCEL? _______________________________________________ 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
