Music on hold is sometimes referred to as phone on hold, message on hold, on hold messaging, hold music, etc. Hold music is recorded music to fill the silence that would be heard by telephone callers who have been placed on hold.  Good hold music can help to keep a lead on the line. 

Upload your Audio (see FAQ for How to Upload Audio Media)

From the Dashboard, click on Phone System and select Music on Hold from the drop down.

From there, go to Add Music on Hold

Type the Description and Select the Audio File and click Add.

Click on Apply Changes.