> Two questions about SDP Origin, o=, field > when setting up a call between two UA. > > 1. UA1 sends, for example, this sdp data to UA2 in the Invite: > "o=mhandley 2890844526 2890842807 IN IP4 126.16.64.4" > Does UA2 need to use any of these fields when it answers?
No. > Does anyone have an idea of the "o=" field in > the 200 OK? The following four documents should help: http://www.ietf.org/rfc/rfc2327.txt?number=2327 http://www.ietf.org/internet-drafts/draft-ietf-sipping-basic-call-flows-02.t xt http://www.ietf.org/rfc/rfc3264.txt?number=3264 http://www.ietf.org/internet-drafts/draft-ietf-mmusic-offer-answer-examples- 01.txt > Is the "o=" field even mandatory in the response? Yes. > 2. If I send an re-Invite (in my case a > call hold), does the "o=" field need to have > anything to do with the "o=" field of the > last request? If the origin line is the same, it is assumed that this sdp is exactly the same as the prior sdp. The version should be higher if all the rest of the origin line has not changed and something has changed elsewhere within the sdp. Otherwise a re-invite origin line can be completely different from the previously sent sdp's origin line. > I remember reading somewhere that one of the > fields must be increased by one. Can anyone > give an example of how it should look like? Based upon you prior example: "o=mhandley 2890844526 2890842808 IN IP4 126.16.64.4" _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
