Hi Paul, I think she is querying what the UAC will react to the 180 ring message with a SDP offer. As we know, if the initial invite contains the SDP offer, then the first 18x reliable provisionable response could carry the answer. This 1st 18x could be the 183 session progress, so will the subsequent 180 ring message with the SDP offer be rejected or accpeted by the PRACK message?
Alex Zhang ESN: 6-554-8782 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Kyzivat Sent: Monday, March 03, 2008 9:24 PM To: christina yuen Cc: [email protected] Subject: Re: [Sip-implementors] what about swich behaviors when it receivesan 180 Ringing with an new SDP offer? christina, I'm sorry, but I can't figure out what you are asking below. If you haven't already, see if http://www.ietf.org/internet-drafts/draft-ietf-sipping-sip-offeranswer-0 6.txt answers your question. Paul christina yuen wrote: > My understanding is > > 1> if an SDP offer received in a SIP request, such as all media > 1> streams > in the SDP offer, => the SDP answer is returned in a 488 Not > Acceptable Here response and a SIP607 log is generated. > > 2> If an SDP offer received in a provisional response, such as all > 2> media > streams in the SDP offer, => it must be rejected, the SDP answer is > returned in the PRACK. > > > > Now an new SDP offer is received in a provisional response, 180 > Ringing, then the switch should reject the SDP offer in PRACK. Do you > think it is right? Thanks. > > > > Christina > _______________________________________________ > 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 _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
