Most phone systems have a music on hold input (normally labeled MOH or Music On Hold). Some are more obvious than others, but we have yet to find a phone system that doesn’t already have a input or some sort of connection already established.
There are two options for playing your on hold message program:
CD Player – this is the least expensive option. In fact, a small Walkman style CD player is all you need. You can purchase this from any electronics store for under $100. Just make sure it comes with an A/C adapter, as many CD players of this size are battery only, and a repeat button. A CD player, for the most part, works fine, but there are two drawbacks: One – CD players were not meant to be on continuous play 24 hours a day, 7 days a week and with moving parts will most likely breakdown at a year or less. Two – the repeat button doesn’t always stay on and your message program will stop.
Digital Message Player – this is similar to an mp3 player. Your on hold message and music program plays continuously with no moving parts. Prices vary.