[asterisk-users] GSM codec is a good choice ???

[Steve Edwards]

On Mon, 23 Feb 2009, Alejandro Cabrera Obed wrote:

> Dear all, I have Asterisk 1.4 with SIP. I have a voicemail implemented 
> with GSM sound files.
>
> The problem is I have IP phones Utopix HyperPhone 202 which support only 
> G.729a/u and G.723.1 high/low, but not GSM.

g723 is supported by Asterisk. I've never used it, but it shows up with 
the "show codecs" command.

> If I choose G.729A the "pass-throu" calls among users are OK, but 
> Asterisk can't transcode GSM to G.729A in voicemail calls.

Because you don't have a g729 codec?

> My company doesn'y want to pay for a G.729 license, so I'm thinking to 
> buy new IP phones with GSM support, so I have no problem with the 
> voicemail system.

You may want to rethink this. G.729 licenses are only $10 per channel. Can 
you replace the instrument and retrain your users for $10 each?

> (Maybe in the future I need to connect the Asterisk with the PSTN, GSM 
> doesn't matter at this point ???)

That would depend on how you interface to the PSTN.

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