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

[Steve Totaro]

MOSBAH ABDELKADER wrote:
> Hello all,
>
> 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.
>
> Thanks.
>
> Abdelkader Mosbah

voip-info.org and google are your friends.

http://www.voip-info.org/tiki-index.php?page=Convert+WAV+audio+files+for+use+in+Asterisk