[asterisk-users] Converting an audio file to a ".gsm" format

[Andrew Joakimsen]

On 8/12/07, MOSBAH ABDELKADER <abdelkader2006 at gmail.com> wrote:
> have anyone an idea about converting an audio file (.wav, .mp3, .au,...) to
> a ".gsm" audio file to use it as a voicemail file with Asterisk.
>

The program is called SoX. If you search voip-info.org you can find a
nice guide with step-by-step instructions. I would suggest you not use
the GSM format, unless you expect a majority of your calls to be in
the GSM codec.