[SIPForum-discussion] Query about SDP in SIP.

[Sriram Subramanian]

Hi Karthic ,
         I would slighlty defer from your answer which u have mentioned
below .Its basically an offer answer model and in your case explained u had
mentioned INVITE with SDP which is an offer and 180 with SDP which is an
answer then in 200 OK if u have another SDP it implies that this is now a *new
offer and not an answer* as there was no offer further and u can reply to it
with ACK request.Pls refer to the links provided

Regards,
Sriram



On Mon, Dec 7, 2009 at 10:15 AM, JEEVANANDHAM KARTHIC KUMAR <
Karthic_Kumar.Jeevanandham at alcatel-lucent.com> wrote:

>  Hi Shivlakhan Patel,
>
> Please ref the RFC3311.
>
> find my answer inline.
>
> Regards,
> Karthic kumar J
> ------------------------------
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *lakhan patel
> *Sent:* Friday, December 04, 2009 2:37 PM
> *To:* discussion at sipforum.org
> *Subject:* [SIPForum-discussion] Query about SDP in SIP.
>
>  Hi Guys,
>
> Can any one explain me the Offer-Answer in SIP.
>
> 1) Initial *Invite *with Initial-SDP            *(Is it Offer? I guess
> YES).*
> *=> YES*
>
> 2) *180 *with New-SDP and Require: 100Rel            *(Is it new Offer or
> Answer)*
> *=> It is Answer*
>
>             1. In this I am sending New-SDP1 only with new Version and
> Session-ID and one A-line and M-line from the Initial-SDP.
>             2. In *PRACK *without SDP.
>             3. In *200 Ok *for invite with New-SDP1.             *(Is it
> Answer?)*
> *=>It is also Answer*
>
> 3) Now *UPDATE *from A-side to B-side with New-SDP2 and again only with
> new Version and Session-ID and one A-line and M-line from the Initial-SDP.
>             *(What should trigger at B-side).*
> *=>200OK for UPDATE with SDP-2 Answer.*
>
>
> Can any one [provide me some good reference so that i can read all these
> from there?
>  => Ref RFC3262 and RFC3311
>
> --
> Thanks & Regards
> Shivlakhan Patel
> Email: lakhan.p at gmail.com, lakhan.p at hotmail.com
> IBM India Private Ltd. Bangalore
> Contact: +91-9902791177
>
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