[Asterisk-Users] Converting .wav to .WAV

[Mimmus]

Hi,
how can I convert .wav files to .WAV:

# file greet.*
greet.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit,
mono 8000 Hz
greet.WAV: RIFF (little-endian) data, WAVE audio, GSM 6.10, mono 8000 Hz

using 'sox'?

Thanks
-- 
Domenico Viggiani