2009/4/30 Pranab Bohra <[email protected]>: > Hi, > > Following is the call flow (based on the traces taken at UA1 and UA2): > > 1. UA1 sends offer to UA2 (proxy) > 2. UA2 forwards the offer in INVITE to another proxy UA3 > 3. UA3 answers to the offer with a held SDP in 200 response (because > it probably does not yet know who is going to receive the call > eventually)
Sorry for my English, but what does "held SDP" mean? > 4. UA2 ACKs the 200 response ¿?¿ A proxy CANNOT send an ACK for a received 200!! Are you sure you mean "proxies"? > 5. UA3 sends INVITE back to UA2 immediately, this time with an updated SDP. Sorry, I'm completely lost. In step 3, UA3 received the INVITE and "auto"-generated a 200 Ok, what do you mean know with "UA3 sends INVITE back to UA2 immediately"? > The question is - In response to the last offer by UA3, what should > the UA2's reply ? Can it send the same SDP that it had sent in step 2 > ? > > My concern is, if it does so, wouldn't UA3 discard it as a duplicate SDP ? I've understood basically nothing, so the only I can say is the following: - The SDP CANNOT change during an early-dialog (same To tag). So if a UAS sends 180/183 with a SDP, it CANNOT send later a 200 with a different SDP. But probably it has nothing to do with your scenario. -- Iñaki Baz Castillo <[email protected]> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
