MOH, use to be an easy application for interfacing any type of player until the "headset out" jack was replaced with the "universal/MP3 in jack" allowing the client to plug their component directly into the player. Commonly the CD player was ultilized for music-on-hold, now it is not accessible. There are still music components still available but not so widely available. It use to be a quick trip to Walmart or CVS to purchase the unit, now, the "headset out" jack has become illusive.