Hi Salil
As per offer answer model, SDP in PRACK can be an offer as well as an answer.
Refer RFC 3262 and
http://tools.ietf.org/html/draft-ietf-sipping-sip-offeranswer-18 for further
details:
Excerpt from the offer-answer draft:
Offer Answer RFC Ini Est Early
-------------------------------------------------------------------
1. INVITE Req. 2xx INVITE Resp. RFC 3261 Y Y N
2. 2xx INVITE Resp. ACK Req. RFC 3261 Y Y N
3. INVITE Req. 1xx-rel INVITE Resp. RFC 3262 Y Y N
4. 1xx-rel INVITE Resp. PRACK Req. RFC 3262 Y Y N
5. PRACK Req. 200 PRACK Resp. RFC 3262 N Y Y
Regards,
Tarun Gupta
Aricent
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Verma,
Salil (NSN - IN/Gurgaon)
Sent: Monday, September 05, 2011 9:46 AM
To: [email protected]
Subject: [Sip-implementors] PRACK Message
HI Experts ,
Do PRACK Msg contain SDP information . as per Standard theory PRACK is
only acknowledgement.
But in my case I can see that Prack is coming with SDP .
Kindly suggest what can be the reason.
Thanks,
Best Regards
sAlil veRmA
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