Sox > Audacity

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:

Encoding: 8-bit CCITT u-Law or a-Law
Data Rate: 8 Kbps
Sample Rates: 8 kHz, 16 kHz, 32 kHz, 48 kHz
Audio Sample Size: 16-bit PCM
Channels: 1

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!