This violates the Offer/Answer model. See RFC 3264. The SDP in INVITE is the offer, and the SDP in 183 if present, it is early answer. So, if an answer is generated in 183, the same MUST be used in 200 OK too. Suppose the 200 OK choose to send different SDP, then it may be achieved by using different To Tag, and the caller will handle as faked forked call and accept the modified SDP in 200 OK.
Thanks, Neel > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:sip-implementors- > [EMAIL PROTECTED] On Behalf Of Siva M-Q16748 > Sent: Friday, April 20, 2007 9:18 AM > To: Sarkar, Uttam; [email protected] > Subject: Re: [Sip-implementors] Early-media > > What would be the issue if they are not the same ?? > > > Siva M > -----Original Message----- > From: Sarkar, Uttam [mailto:[EMAIL PROTECTED] > Sent: Friday, April 20, 2007 7:49 PM > To: Siva M-Q16748; [email protected] > Subject: RE: [Sip-implementors] Early-media > > SDP in 183 and 200 must be same. > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Siva > M-Q16748 > Sent: Friday, April 20, 2007 10:13 AM > To: [email protected] > Subject: [Sip-implementors] Early-media > > > Can the SDP of 183 and 200 OK be different > > I read somewhere that they should be the same > > If so , Is there any Logical reason why these two should be different ?? > > Siva M > > > Siva M > > _______________________________________________ > 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
