Can turn BGM on/off at phones using PROGRAM 65, but have not found definitive instructions for programming a button to toggle on/off. What am I missing?
Thanks

Program an unused CO button to speed dial *7511 on & *7510 off

You did opt for the "built in MOH music source" ...correct? I think it's Mary had a little lamb in MIDI format..or ice cream man music.... LOL!
What were they thinking!?

Old Macrotel systems had that cheesy music in MIDI..though they were ahead of their time for that back then..