[asterisk-users] forcing GSM on certain extensions

Steve Edwards asterisk.org at sedwards.com
Tue Dec 30 19:15:53 CST 2014

On Tue, 30 Dec 2014, Joseph wrote:

> I'm trying to force GSM when I call on certain extension but I'm getting 
> connected with "ulaw" Which is not suitable when bandwidth is low and 
> slow.
> my phone is iax-322
> in iax.conf
> [iaxy-322]

According to:


The IAXy was initially released as a ULAW only device with ADPCM 
'promised' in a future firmware release. No mention of GSM.

Is your experience different?

Thanks in advance,
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000

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