Dear All,
I have a call flow like this. UAC(SIP) -----> Invite/without SDP ------> B2BUA -----Invite/with SDP default port-----> UAS(SIP) Now as far as I know what RFC says that: “The initial offer MUST be in either an INVITE or, if not there, in the first reliable non-failure message from the UAS back to the UAC. In this specification, that is the final 2xx response” Here is what happening at my case that my source UA is sending me invite without SDP to my SBC and my SBC is forwarding the same to termination UA with default port as per the design. But from Termination side I am getting first 183 w/o SDP and others 2 with SDP before getting 200 OK w/ SDP in the correspondence of initial offer INVITE. And in those 183 I am getting “100rel” in REQUIRE header field which is not correct according to me. Because my understanding says that in those scenario where you are getting initial OFFER w/o SDP, PRACK should be not be negotiate before getting the 200 OK w/ SDP for the initial invite. Hence I am facing the media issue. Now I might be wrong too…Could any please help me on this and if need the traces then I can also share. Thanks, Nitin Kapoor _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
