[asterisk-users] Problems with codec translation when using Monitor and MixMonitor

[Kevin P. Fleming]

On 01/12/2012 11:57 AM, Daniel - Asterisk wrote:
> The simplest answer, I purchased one additional license and one
> simultaneous call is being recorded now. I do not understand why the
> ulaw codec (or format) is involved here (... No translator path from
> alaw to unknown ...)
>
> Any entry will be very appreciated.

When you say 'call', do you mean a call between two phones (endpoints)? 
If so, and both endpoints are using G.729 for audio, then yes, recording 
that call in any format other than G.729 will require *two* G.729 
decoders, one for each audio stream being received by Asterisk. Even in 
a case where you are only recording the combined audio from the two 
phones (MixMonitor), the audio must still be decoded in order to be mixed.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
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