[asterisk-dev] Codec Negotiation in Asterisk

[North Antara]

> Ravi Shankar wrote:
>
>> But if the phone A had chosen GSM then there is no transcoding required.
>> So I guess if Asterisk on its invite message to Phone A had put GSM as
>> its first priority then there wouldn't have been a need for transcoding.
>
> Asterisk is supposed to do that already. If it is not doing so, that is
> a bug.
>

A bug that might already be fixed in 1.2.4.  Try upgrading and see if the
problem persists.


>> I am new to Asterisk development and I'm not sure on what basis asterisk
>> decides to send all the configured codec instead of filtering it out
>> based on the incoming SDP.
>
> The incoming SDP is not relevant. Asterisk is not a proxy, and does not
> behave like one. The two channels are entirely independent, and may not
> even be SIP on both sides (in which case there is no 'incoming SDP').
>
> Each call is negotiated separately, except for prioritizing the incoming
> format in the outgoing INVITE if the outgoing peer is configured to
> support it.
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