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 <pkyzi...@alum.mit.edu>
wrote:
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
>------------------> B
> 2) A <-------------- 180 Ringing [Require: 100 rel] with SDP offer
>------------ B
> 3) A ---------------- PRACK without SDP
> ------------------------------------------> B
> 4) A <---------------- 200OK for PRACK
> ------------------------------------------------- B
> 5) A ------------------- UPDATE with SDP answer
> ----------------------------------> B
> 6) A <----------------------- 200OK for UPDATE
> -------------------------------------------- B
> 7) A <----------------------- 200OK for INVITE
> ----------------------------------------------- B
> 8) A ------------------------------ ACK
> -----------------------------------------------------------> B
>
> Whether the above Call flow Diagram is a valid one? I mean without sending
> SDP in PRACK [in frame 3]as per RFC 3262, can I send it using UPDATE as per
> RFC 6337?
> Also is the below call flow DIAGRAM is also valid.
> 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
> ------------------------------------------> B
> 4) A <------------------- 200OK for PRACK
> --------------------------------------------- B
> 5) A <----------------------- 200OK for INVITE
> ----------------------------------------------- B
>
> 6) A ------------------------------ ACK with SDP answer
> -------------------------------> B
> Here without sending SDP in PRACK [in frame 3]as per RFC 3262, can I send it
> by ACK?
>
>
> Thanks,
> Sourav
>
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