Hi,
“Correct” means to supply a syntactically correct SDP complying with the offer/answer rules. This corresponds to your second option. Section 5.2.4 is more explicit about your second option. *From:* sip-implementors-boun...@lists.cs.columbia.edu [mailto: sip-implementors-boun...@lists.cs.columbia.edu] *On Behalf Of *Harald Radke *Sent:* Monday, May 11, 2015 6:09 AM *To:* sip-implementors@lists.cs.columbia.edu *Subject:* [Sip-implementors] RFC6337 - reacting on an unacceptable offer in response Hi list, Just joined and hope that this is not too dumb of a question nor has it been answered before: given a UA receives an SDP offer in a resonse (e.g. the 200 OK of its previous INVITE), and realizes it has no means of dealing with the offered media (e.g. one medai entry with a single codec description which is not compatible with the one of the receiving UA). RFC 6337 state that: "When a UA receives a response with an offer that it cannot accept, the UA does not have a way to reject it explicitly. Therefore, a UA should respond to the offer with the correct session description and rearrange the session parameters by initiating a new offer/answer exchange, or alternatively terminate the session" What does "correct" session description mean in this context? 1- the SDP the UA would be able to accept (basically like sending an offer? 2- an answer according to RFC3264, where the media entry has a RTP port of 0 indicating that the media is not accepted? (I would vote for 2 since it would follow the more general SDP offer/answer procedure, but not sure) Thanx and regards Harry _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
