This is a complex subject. Start by reading
http://www.ietf.org/internet-drafts/draft-sawada-sipping-sip-offeranswer-01.txt
If that doesn't answer your questions, then ask again.
Paul
[EMAIL PROTECTED] wrote:
> Hi,
>
> Please let me know if my understanding is correct for regular session
> offer-answer when PRACK is used:
>
> For INVITE containing SDP, and if offer answer done in the using reliable
> 183 response for early media, 200 OK response SDP will have an answer for
> the regular session, so 200 OK SDP will be answer to the offer sent in
> initial SDP.
>
> Similarly, if INVITE does not have SDP, and if offer-answer done using
> PRACK, still 200 OK will contain the regular session offer and answer will
> be present n the ACK message.
>
> Similarly, if UPDATE is used for offer-answer before call is connected, it
> will not affect the regular session offer-answer, it will be taken care by
> initial INVITE , final 200 OK and ACK message.
>
> Thank,s
> Udit
>
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