On 9/5/11 12:23 AM, Tarun2 Gupta wrote:
> 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:
The latter is now RFC 6337 (finally!)
Thanks,
Paul
>
> 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 .
>
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>
> Kindly suggest what can be the reason.
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> Thanks,
> Best Regards
> sAlil veRmA
>
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