hi,
   if the 200 ok without SDP is send for any reasons than it totally depends
upon the code implementation of the B2BUA , what message it expects to
receive. It could be bye or some 4xx response too.

Regards
Abhishek

2008/11/20 Anuradha Gupta <[EMAIL PROTECTED]>

> Without an answer to offer the session can not be established.
> Therefore if such a final response is received without the SDP (answer)
> then the session should be immediately terminated by BYE.
>
> Regards
>
> Anuradha Gupta
> Aricent
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:
> [EMAIL PROTECTED] On Behalf Of NC Reddy
> Sent: Thursday, November 20, 2008 3:13 AM
> To: sip-implementors@lists.cs.columbia.edu
> Subject: [Sip-implementors] Question: Does 200 OK(INVITE) without SDP
> isvalid response for INVITE with SDP offer?
>
> Hi,
>     I have the following context question:
>
> UAC <------------->AS(B2BUA)
> | ------F1 (INVITE)--->
> *           SDP-Offer*
>
> <-----F2: 100 Trying---
>
> <----F3: 200 OK*(NO-SDP)*----                   //Does this step is valid
> without SDP, ?:
>
> ------F4:ACK------------>
>
> Questions:
>
>   - Does the 200 OK response without SDP -Answer is a "valid" sip response
>   in the above context?.
>   - If not what are the reason(s)?
>
> Regards
> Channa
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