For rest of media codec not supported  is muted( make port 0) by  answerer




 Regards
Sanjiv 




"B, Nataraju" <[EMAIL PROTECTED]> 
Sent by: [EMAIL PROTECTED]
08/31/2006 11:35 AM


To
"Prasad, Rishi Kaushal" <[EMAIL PROTECTED]>
cc
sip-implementors@cs.columbia.edu
Subject
Re: [Sip-implementors] Re-INVITE in the offer answer model.






Why is this required ? 

Codec negotiation completed soon after 200OK received. 

Regards,
Nataraju A B
Sonus Networks Ind Pvt Ltd
+91-80-4190-2681

> -----Original Message-----
> From: [EMAIL PROTECTED]
[mailto:sip-implementors-
> [EMAIL PROTECTED] On Behalf Of Prasad, Rishi Kaushal
> Sent: Thursday, August 31, 2006 10:35 AM
> To: sip-implementors@cs.columbia.edu
> Subject: [Sip-implementors] Re-INVITE in the offer answer model.
> 
> One query for u all
> 
> 
> 
> In a call scenario when offerer sends an INVITE to support different
> media codec (assuming 0 8 2) and gets a 200 OK response form the
> answerer with supporting only one codec (assume 0).
> 
> 
> 
> In this case as the offerer knows that the answerer is going to send
> only one of the codec (as specified in the 200 OK by the answerer).
> Isn't the offer answer is complete?
> 
> 
> 
> Or the offerer is required to send a new offer with only one of the
> codec sent by the answerer and expect a response for it.
> 
> 
> 
> The call flow is:
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Offerer                                         Answerer
> 
>    ---INV w SDP + IAM Cseq(codec value=0, 8, 2) -->
> 
>    <------183 + ACM---------
> 
>    <------180 + CPG---------
> 
> 
> 
>    <------200 OK (codec value=0) --------
> 
>    -------ACK------------->
> 
> 
> 
>
-----------------------------------------------------------------------
> 
>                  Voice path
> 
>
-----------------------------------------------------------------------
> 
> 
> 
>   -re-INVITE w PCMU Cseq (codec value=0) ----> Is this re-invite is
> required by offerer as it already knows the unique codec value used by
> the answerer?
> 
> 
> 
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@cs.columbia.edu
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