Hi Everyone, I was faced with the following question, while working on issues related to inconsistency of SDP "o=" line and call forking. E.g. say we have Alice and Bob, both are UAs.
Alice initiates a call to Bob by sending of INVITE w/SDP Offer, but Alice doesn't support UPDATE&PRACK (doesn't matter why). Bob would like to provide a kind of early media, so it sends media capabilities with forked 18x (180/183) responses. So, we have the following call flow: Alice Bob INVITE w/SDP0 ----------------------> .... 180 w/SDP1, to-tag=1 <---------------------- 183 w/SDP2, to-tag=2 <---------------------- .... 200 OK w/SDPn, to-tag=n <---------------------- So, here we have multiple SDP Answers sent within different SIP dialog. The question is: What should be the "o=" line of each SDP Answer? Should it be unique for each dialog? Thanks in advance, ----------------- Aleksey Entsov mailto:[email protected] _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
