Hello Anish , Why can't you send the answer to the new offer(in PRACK) in the 200 OK response to the PRACK and use the re-negotiated media for the session ? Once the other end gets the answer he will also switch to the new media description in the answer.
Regards , Sayan ________________________________ From: [EMAIL PROTECTED] on behalf of Anish. T. George Sent: Tue 5/30/2006 5:10 PM To: Sip-Implementors ([email protected]) Subject: [Sip-implementors] Race condition: PRACK-200 OK INV Hi, i have a question Section 3 of RFC 3262 mentions "The UAS MAY send a final response to the initial request before having received PRACKs for all unacknowledged reliable provisional responses, unless the final response is 2xx and any of the unacknowledged reliable provisional responses contained a session description." In a scenario the reliable 1xx did not have SDP and we go ahead and send 2xx for Invite without waiting for Prack. What if the Prack for the relaible 1xx we receive has an offer? Invite (SDP)------> <------- 100 Trying <------- 183 (SDP) --------> PRACK (no SDP) <------- 200 OK (no SDP) <------- 180 (no SDP) <------- 200 Ok for Invite (No SDP) Prack (SDP)------> By sending the offer in PRACK user wanted to re-negotiate the parameters, but in this case we have already sent 2xx for invite and other side will respond with ACK and the session will be established as per SDP exchange in Invite and 1xx. How does above statement mentioned above from the RFC take care of this scenario?? your comments will be geatly appreciated. Thanks Anish _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
