> Dear All,
> Got few questions as follows regarding the Codec negotiation in SDP
>
> 1. Can there be an INVITE without SDP? (Resulting no Codec offer to the
> other party)
Yes it is possible.
Section 13.2.1 of 3261 says
o The initial offer MUST be in either an INVITE or, if not there,
in the first reliable non-failure message from the UAS back to
the UAC. In this specification, that is the final 2xx
response.
>
> 2. If so, what would be the response from the other party (Should it
> reply with any codec supported, or all the capable codec's)
>
It should be the capable ones. Not sure.
> 3. Can the Codec negotiation takes place using the responses 180 or 183?
> (Without using 200 OK)
3261 says, offer should be in reliable non-failure message (200 OK).
However, offer is possible with 100rel I think. Using this extension,
provisional messages are treated as reliable. It is defined in RFC 3262.
Regards,
Ritul Sonania
Niksun India Pvt. Ltd.
>
> Thanks
> BR,
> Manoj
>
>
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