All of your phones plug into a Panasonic Key Service Unit. The music source plugs into a port on the KSU. A TA series has 11 modular jacks on the main board and 2 1/8" jacks labeled EXT MUSIC and PAGING. Guess which one goes to the music source :-).
There will be a cable plugged into it and into the music source. That's where you change the messages or music.
Carl
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