[SIPForum-discussion] Query about SDP in SIP.

[JEEVANANDHAM KARTHIC KUMAR]

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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