Did you also acquire an ASCAP/BMI license for the music-on-hold? A lot of people are unaware that is classified as a public performance of the music and requires a license. Unless you are playing royalty-free music, in which case you are fine.
I purposefully sought out royalty-free music. As the person who set it up, I did not want to risk being culpable for anything. (When it was first set up, my boss kept requesting that I add various catchy songs he heard on the radio to it, and I kept having to explain it's not legal.)
