[asterisk-users] SIP Codec negotiation

[Steve Edwards]

On Fri, 11 May 2018, Joshua Colp wrote:

>> In the above example, even though the INVITE/SDP says they prefer gsm 
>> over ulaw and the OK/SDP says I prefer ulaw over gsm, they can choose 
>> to use gsm or ulaw?
>
> Yes.
>
>> Can it be asymmetrical? They send gsm and I send ulaw?
>
> Technically, yes. In practice it's a bit iffy - specifically because 
> some DSPs in devices won't allow it - they require a single codec be in 
> use for each direction.

So, Asterisk will defer it's choice of codec to match the codec it detects 
in the incoming stream?

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
             https://www.linkedin.com/in/steve-edwards-4244281