Creating music on hold for Mitel with Audacity.

The Mitel 3300 is very picky about the format of MOH files you can upload. First I find free music from somewhere like archive.org. Open the file with Audacity and convert track to mono. Change the Project Rate to 8000 Hz and then export as WAV (Microsoft) and U-law.

Update:

Check Ghost Notes for some interesting hold music. The artist gave me permission to use his stuff.

http://ghostnotes.blogspot.com/