That answered my question. My question should have been "does IAX use codecs
like SIP does?" and since you send gsm over IAX then the answer is yes.

Thanks,
Matthew
----- Original Message ----- 
From: "Rich Adamson" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<[email protected]>
Sent: Wednesday, December 22, 2004 3:22 PM
Subject: Re: [Asterisk-Users] 711 and 729 with IAX? (IAX Newbie)


> > If I send a call to a provider over SIP, I have to designate which codec
to
> > use (711 or 729).
> > Having never used IAX I have to ask: If I send a call via IAX does IAX
use
> > 711/729 as well?
> > If a SIP 729 call uses 20Kbps, what does an IAX/729 call use?
>
> Depends on how you have asterisk setup. Most of us happen to use
> gsm over iax which works great (from my perspective) for voice.
>
>
>
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