HOWTO GSM Audio Files Conversion
From Bicom Systems Wiki
To export audio files to '.gsm' format, download 'Switch' converter program for Windows. It is easy to use and allows audio file conversion from one format to another. All major audio file formats can be loaded and converted using this program.
Switch supports (wav, mp3, ogg, gsm, dct, flac, au, aiff, vox, raw, wma, aac, atrac (.wav), ra, ram, dss, msv, dvf)
Switch download link: http://nch.com.au/components/switchsetup.exe
Please consult the manufacturers' sites for additional information.
