The UAC is defective. Here UAS should terminate the session. It may
re-initiate offer/answer again by sending re-INVITE but this will lead
to same situation again.
There is no point for UAS to continuing the call with previous SDP
because there is no surety that UAC will be doing the same as it has
sent codec-3 which anyway is not understood by UAS.

http://www.veraznetworks.com/
/Vikram
On Mon, Mar 17, 2008 at 1:33 PM,  <[EMAIL PROTECTED]> wrote:
> Hi,
>
>  Can anybody give guideline about the UAS Behavior as below:
>
>   UAC                               UAS
>  <========== Session Establised=========>
>   |                                 |
>   |-----Re-invite(w/o SDP offer)--->|
>   |                                 |
>   |<----200 OK(Codec1, Codec2)------|
>   |                                 |
>   |-------ACK (Codec 3)------------>|
>   |                                 |
>   |                                 |
>
>  Will UAS release the call or continue the call with the previous SDP?
>  Thanks,
>
>  Alex
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