thanks Roman do you by any chance happen to roughly remember the rfc section that specifies that requirement?
thanks again Manolis On Wed, Jan 7, 2015 at 5:49 PM, Roman Shpount <[email protected]> wrote: > On Wed, Jan 7, 2015 at 6:14 PM, Manolis Katsidoniotis <[email protected]> > wrote: > >> I have an IMS scenario where offer/answer is complete, users are in >> talking >> state using one simple audio stream. >> >> (Much sooner than) half the session time, >> B side client is attempting to refresh the session >> using re-INVITE without SDP. >> A acknowledges the refresh with 200OK without SDP >> >> As far as I know this is not an error as session refresh does not require >> SDP,, >> however it is rejected by the servers with cause invalid offer/answer. >> >> Should I include the SDP nonetheless and keep the same session id & >> version >> in the origin header? >> > > INVITE transaction without SDP in either INVITE or 200 OK is invalid. SDP > should always be present in INVITE success response (either answer if SDP > offer was sent in the INVITE or offer if no SDP was sent in the INVITE). > > One option is to send INVITE with the same SDP, which ideally should get > you the same SDP in response, but you should be prepared for a different > SDP as well. The better option is to do a session refresh using an UPDATE > request without SDP. > _____________ > Roman Shpount > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
