[SIPForum-discussion] Query about SDP in SIP.

[lakhan patel]

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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