No...the 200 OK for the INVITE should not carry any new offer, since the
answer for the offer in the INVITE is already done. If the 200 OK- INVITE
contains some SDP that should be same as the answer SDP that was sent in the
reliable provisional response (answer1).
Thanks,
Arnab
On Tue, Jan 20, 2009 at 1:00 PM, Subbu Rajendran
<subbu.rajend...@gmail.com>wrote:
> Hi All,
> Following is example call flow from RFC 3311 (SIP UPDATE Method). Is SDP a
> must in the 200 OK for INVITE in this case? If it is required, then 200 OK
> should contain 'answer 3'. Is this a legal behavior as answer in 200 OK for
> INVITE ('answer 3') is not based on the offer in the INVITE ('offer 1').
>
> Could anyone please explain or point me to the RFC that explains this case?
>
> Caller Callee
>
> (1) INVITE with offer 1
> |---------------------------->|
>
> (2) 180 with answer 1
> |<----------------------------|
>
> (3) PRACK
> |---------------------------->|
>
> (4) 200 PRACK
> |<----------------------------|
>
> (5) UPDATE with offer 2
> |---------------------------->|
>
> (6) 200 UPDATE with answer 2
> |<----------------------------|
>
> (7) UPDATE with offer 3
> |<----------------------------|
>
> (8) 200 UPDATE with answer 3
> |---------------------------->|
>
> (9) 200 INVITE (SDP ?)
> |<----------------------------|
>
> (10) ACK
> |---------------------------->|
>
>
> Thanks & Regards,
> Subbu
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