[SIPForum-discussion] Query about SDP in SIP.

[volkan kahyaoglu]

First take a look at the RFC3311. and then RFC 3264... 

You can find call flow examples @    http://excelsupport.dialogic.com/imgpubs/webhelp/Description/SIP/SIP_PRACK_Call_Flows.htm


Regards,
Volkan

Date: Fri, 4 Dec 2009 14:36:51 +0530
From: lakhan.p at gmail.com
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).
2) 180 with New-SDP and Require: 100Rel            (Is it new Offer or 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?)

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).


Can any one [provide me some good reference so that i can read all these from there?
-- 
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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