Let’sassume a session is in place, established through an offer/answer exchange witha single media stream (i.e. a single m line).
Then, theUAC A sends a reINVITE containing an SDP offer having two m lines, and theoffer is rejected by the UAS B (let say with a 488). Thequestion is about the number of m lines needed in the following SDP offer. According to RFC3264: ‘’ If anSDP is offered, which is different from the previous SDP, the new SDP MUST have a matching media stream for each media stream in the previous SDP. In other words, if the previous SDP had N"m=" lines, the new SDP MUST have at least N "m=" lines ‘’ From the Bperspective, it may be considered allowed sending a single m line, as it neversent two m lines nor it accepted them. From the A perspective, RFC3264 says itshould send two m lines. A, on the other hand, should be ready also to accept asingle m line. The RFC isclear in case of successful O/A exchange, but not so much in case of failure. Any opinionor fact about? Andrea _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
