For questions like this you should see
http://www.ietf.org/internet-drafts/draft-ietf-sipping-sip-offeranswer-01.txt.
Paul
River wrote:
> Hello All,
>
> I have a question about 200 OK for INVITE.
> Let's suppose an UAC sends out an INVITE/SDP, then the UAS replys with
> 180/SDP and 200 OK for the INVITE.
> Is it compulsory that the 200 OK for the INVITE also contain SDP (where the
> 180 Ringing already has SDP)?
> Thank you very much!
>
>
> Best Regards,
> River
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