[Asterisk-Users] Asterisk and unknown codecs and GSM

[Darran Wilson]

Somewhat along these same lines, I'm using MS Netmeeting to call the demo
"time" and I get no sound or very bad sound when I manually select ulaw in
NM.  I can connect in OpenPhone , hear the call perfectly, and see that is
is using different codecs.  Is there a way to give a priority to which
codecs asterisk uses?

darran



----- Original Message ----- 
From: "Michael Graff" <Michael_Graff at isc.org>
To: <asterisk-users at lists.digium.com>
Sent: Friday, May 02, 2003 1:22 AM
Subject: [Asterisk-Users] Asterisk and unknown codecs and GSM


> I have a Cisco 2600 which understands the "gsmfr" codec, which appears to
> be what Asterisk calls "gsm" -- at least it ends up using it.
>
> I also have a PSTN gateway which is speaking ulaw.
>
> When the 2600 calls through Asterisk to the PSTN, it negotiates the
> g711ulaw codec, but when the PSTN calls through Asterisk to the 2600,
> it seems that Asterisk is doing translation, and it is doing it very
> badly.  I get stuttered, choppy speech which sounds like it's being
> played back at half speed.
>
> My first question is why is Asterisk attempting to do codec
> translation on this call, and how can I make it stop but still
> support gsm <-> gsm calls?
>
> My second question is, can Asterisk pass unknown codecs along without
> modification, or is the codec negotiation set up before that happens?
> It seems that it wouldbe handy to have SIP to SIP calls use G729
> even if Asterisk can't speak it itself.
>
> --Michael
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