[asterisk-users] g.711 Codec Question

[Michael J. Tubby G8TIC]

Dave,

QAs far as I remember it, it goes like this... if your inside phone is 
*only* G711-alaw and your trunk (SIP or IAX) is *only G711-ulaw that at 
session negotiation (call setup) Asterisk will woprk out that it has to 
remain "in the loop" and transcode.

If you run-up asterisk and bother to watch the start-up debug messages then 
it shows you the relative costs (in terms of CPU utilisation per call) for 
the various transcoding between codecs.  From recollection G.711-Alaw to 
G.711-Ulaw is relatively inexpensive with a cost of "1" ...


Regards


Mike




----- Original Message ----- 
From: "David Thomas" <punknow at gmail.com>
To: <asterisk-users at lists.digium.com>
Sent: Monday, August 14, 2006 8:57 PM
Subject: [asterisk-users] g.711 Codec Question


> Greeting Everyone,
>
> I don't have access to Asterisk box right now or I'd check this myself...
>
> If my client phone uses g.711 (alaw) and my outbound trunk leaving
> asterisk uses g.711 (ulaw), will asterisk have to transcode? If so is
> the processing overhead much?
>
> regards,
> Dave
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