Far and away the best Global Knowledge teacher I ever had introduced me to this handy application.
I had always used audacity to convert WAV files to the proper format for Music on Hold on CUCM. Sox takes what was a convoluted process and makes it as easy as one line in command prompt.
The proper format for the WAV file is:
Audio Sample Size: 16-bit PCM
Now for the wonderfully easy part:
Download Sox here:
Install and run from a command prompt window
The proper syntax for conversion is:
sox.exe c:\PathToOldFileFormat.wav -r 8000 -c 1 -b 8 -e mu-law c:\PathToOutputOfNewFileFormat.wav
Voila! Upload the new file to your favorite Music on hold audio source or UCCX prompt directory and enjoy!