Hi Brett, Actually the INVITE which is coming from source UA to SBC doesnt not have 100rel in Supported header, but yes on the second leg.. from SBC to remote entity have the *100rel* in supported header.
*First leg(from Source to SBC): * *Supported: timer,resource-priority,replaces Supported: Geolocation * *Second leg(from SBC to termination): Supported: timer, 100rel* however i am checking the mentioned RFC too. Thanks, Nitin Kapoor On 10 June 2010 23:45, Brett Tate <[email protected]> wrote: > If INVITE indicated support for 100rel within Supported or Require, see RFC > 3262 section 5. > > > -----Original Message----- > > From: [email protected] [mailto:sip- > > [email protected]] On Behalf Of Nitin Kapoor > > Sent: Thursday, June 10, 2010 1:54 PM > > To: [email protected] > > Subject: [Sip-implementors] Invite without SDP & getting 100rel in 18x > > > > 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 > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
