Usage of SDP in provisional responses is done for the purposes of early 
media. Since there are numerous issues with it, the usage of early media 
has been extracted to a separate specification. This specification is 
currently draft-rosenberg-sip-early-media-00, but is not currently 
stable yet since we are still trying to figure it out.

-Jonathan R.

Hiroshi Waki wrote:

> Hi all,
> 
> I have a question about treatment of a SDP in 2xx response
> which is different from the one in previous provisional responses 
> where these responses are used as answer.
> 
> Although there is a description quoted below in the section 11.2 of bis04, 
> any description corresponding to this seems not to be specified 
> in the bis05 draft or the offer-answer draft.
> 
>     In section 11.2 of bis04;
>        If a later provisional response or 2xx contains a different
>        session description, this new description is treated as if 
>        it were the original response to the session description 
>        in the INVITE.
> 
> Is this specification in bis04, in which the former SDP is overridden 
> by the later SDP, still valid or is this deprecated ?
> If this is still valid, is there any description corresponding the above 
> in the bis05 draft or the offer-answer draft ?
> 
> If this issue has already been discussed, I wonder if you would 
> inform me where the discussion was held ?
> 
> Best regard,
> Hiroshi Waki
> NTT Network Service Systems Laboratories
> 
> 
> 
> _______________________________________________
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> 


-- 
Jonathan D. Rosenberg, Ph.D.            72 Eagle Rock Avenue
Chief Scientist                         First Floor
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