Our current IVR system uses Dialogic VOX files. These are very efficient files. They are small and pack in all the audio that is needed for use over the phone. They are also a very strange format that has historically been hard to handle outside a few utilities. In the process of integrating our existing IVR system and Asterisk there was a need to get Asterisk to play some of our existing audio files. The problem is the VOX files we use are not what Asterisk expects. They sound like a chipmunk cartoon revival when played with its VOX player. Years ago while playing around with the files I tried to convert VOX files to WAVE format. I searched the Internet and tried the SoX utility to no avail. All I got was distorted noise that sometimes sounded like speech. Tonight I tried SoX again and to my amazement, it worked. I'm not sure what changed, but SoX had issues with the VOX files before. A simple command line will convert a VOX file to a GSM or WAVE file using the SoX utility, "sox -r 6022 file.vox -v .3 -c1 -r8000 -w file.gsm". Note the volume adjustment "-v .3" is because our VOX files come out quite hot and thus distorted otherwise. One site I found that might be helpful to others has a VOX <-> RAW converter that might be helpful. It did not seem work for our files though. Vox Audio File Conversion .