How To Convert GSM to WAV and WAV to GSM September 29, 2013arstech Leave a Comment To convert from GSM to WAV: sox input.gsm -r 8000 -c 1 -w -s ouput.wav To convert from WAV to GSM: sox input.wav -r 8000 output.gsm resample -q1 If you like what you are reading, please: Buy me a coffee