Hi, As per me.. INVITE consists Require 100rel, so UAC should respond with PRACK for 18x response. I have tested scenario where the PRACK and 200OK for PRACK have SDP offer & answer. And the 200OK for INVITE will be the same SDP aswer as in 200OK for PRACK. And ACK will be sent without SDP to establish the call.
You can follow below link for more PRACK related call flows: http://excelsupport.dialogic.com/imgpubs/webhelp/Description/SIP/SIP_PRACK_Call_Flows.htm Hope this will help. Cheers, Vinayak On Tue, Feb 21, 2012 at 9:52 PM, Kumar, Hemanth <hku...@sonusnet.com> wrote: > Hi Sai, > > You probably missed the point that INVITE is sent with Require 100rel. So > 18x should contain SDP. > My question is related expected behavior due misbehaving endpoint not > sending SDP in 18x. > > Regards > Hemanth > > > From: Sairam POKKUNURI [mailto:sair...@ipinfusion.com] > Sent: Monday, January 09, 2012 10:22 AM > To: Kumar, Hemanth > Cc: sip-implementors@lists.cs.columbia.edu; Paul Kyzivat > Subject: Re: [Sip-implementors] Expected behavior for an INVITE sent > without an offer > > Hi > > Invite without SDP is initiation of late media. > In that case 18x response can have a complete offer or 200 OK can have an > offer with ack containing answer. > More details are mentioned in RFC 3264 and 3261 > > Reg > Sai > On Wed, Jan 4, 2012 at 8:39 PM, Kumar, Hemanth <hku...@sonusnet.com > <mailto:hku...@sonusnet.com>> wrote: > Hi, > > What should be the behavior of UAC when an INVITE is sent without offer > and Require 100rel and it receives non-reliable/reliable 18x response > without SDP? > > Should the transaction be terminated by sending CANCEL? > > The same scenario was given as comment which has not been addressed in > offer/answer draft-ietf-sipping-sip-offeranswer-03 > > > http://www.softarmor.com/sipping/process/wg-review/reviews/draft-ietf-sipping-sip-offeranswer-03-seth.txt > > " 3. Section 1.1 : > Comment :- We should define the behavior for a UAC which sends out an > INVITE without SDP and receives the first non-failure reliable response > without an Offer, due to the UAS not conforming to the draft. As this > being an open point can lead to multiple different implementations. Does > the UAC clear the call or send a PRACK and wait for the offer in > subsequent reliable responses." > > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu<mailto: > Sip-implementors@lists.cs.columbia.edu> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > -- > With Regards > Sairam > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
