Hi, RFC 3261 section 9.1 says the following, " If no provisional response has been received, the CANCEL request MUST NOT be sent; rather, the client MUST wait for the arrival of a provisional response before sending the request "..
Hope this helps.... Regds, Balaji Murlitharan.C Aricent "Chacoo" <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] 01/08/2007 04:54 PM To <[email protected]> cc 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 *********************** Aricent-Private *********************** *********************** Aricent-Private *********************** "DISCLAIMER: This message is proprietary to Aricent and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. Aricent accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus." _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
