You can create a professional sounding on-hold message with a few tools that you may already have on-hand. All you need is an audio recorder (this could even be your cell phone), a good microphone, and someone who’s willing to be your voice actor.
If you're not actively planning content for your on hold program, and, say, play the radio on hold, you're not controlling what you're playing on hold. You're at the whim of a Radio DJ or program manager, who might play music that's unappealing to your callers or who might be producing and playing ads for your competition.

5.0 out of 5 stars Solved our royalty-free hold music problem It works perfectly as advertised and solved our royalty-free hold music problem. When it arrived, we installed it with our office telephone system and have never needed to worry about it again. It has such a wide selection that callers get different music every time they call - it does not noticeably repeat. We even got a few compliments from clients in the first month (who had apparently got tired of our old 45-second repeating loop). Terrible product, will not work at all I have purchased 2 of them hoping it was a glitch but neither work, in addition I called support, no help at all, said they would call back-never did.
Depending on which ESI phone you have, use the appr opriate diagram (below) to connect it. Each diagram represents the panel on the phone’s underside. Note: The “Top of phone” and “Bottom of phone” references in these diagrams show the correct vertical orientation of the phone — i.e., the part with the display is the top.