Re: [Sip-implementors] Offer Answer Model During Early Dialog

2015-12-18 Thread Paul Kyzivat
On 12/18/15 12:14 PM, Sourav Dhar Chaudhuri wrote: Hi Paul, Thanks for your response. That means both diagrams are wrong. Answer MUST be present PRACK for the diagram mentioned in my mail as mentioned in RFC 3262. Yes. Please confirm my understanding. Thanks, Sourav On Friday, 18 De

Re: [Sip-implementors] Offer Answer Model During Early Dialog

2015-12-18 Thread Sourav Dhar Chaudhuri
Hi Paul,  Thanks for your response. That means both diagrams are wrong. Answer MUST be present PRACK for the diagram mentioned in my mail as mentioned in RFC 3262.    Please confirm my understanding. Thanks,Sourav On Friday, 18 December 2015 9:17 PM, Paul Kyzivat wrote: I agree with t

Re: [Sip-implementors] Offer Answer Model During Early Dialog

2015-12-18 Thread Paul Kyzivat
I agree with the other responses to this query. See RFC6337 for more detail. Thanks, Paul On 12/18/15 7:45 AM, Sourav Dhar Chaudhuri wrote: Hi, Please refer the diagram below Callflow diagram 1) A -INVITE [ Support: 100 rel] without SDP ---

Re: [Sip-implementors] Offer Answer Model During Early Dialog

2015-12-18 Thread Anand Konji
Hi Sourav, Adding some more info as below, Take practical scenario When 180 ringing is sent means device started ringing and user can send 200 ok for invite at any time. So there might 200 ok before update is sent. This might lead to ghost call scenario. In case of invite without sdp, 200ok co

Re: [Sip-implementors] Offer Answer Model During Early Dialog

2015-12-18 Thread Vivek Batra
AFAIK, both of the flows are incorrect. In first case, if SDP offer is in reliable provisional response, PRACK must contain SDP answer. UPDATE can be used any time once SDP offer answer has been done in provisional response and PRACK. Best Regards, Vivek Batra On Fri, Dec 18, 2015 at 6:15 PM, So

[Sip-implementors] Offer Answer Model During Early Dialog

2015-12-18 Thread Sourav Dhar Chaudhuri
Hi,   Please refer the diagram below Callflow diagram  1)  A   -    INVITE [ Support: 100 rel] without SDP   -->  B  2) A   <--   180 Ringing [Require: 100 rel] with SDP offer B 3)  A      PRACK without SDP   --