the mics /cics systems don't have volume control for the music input (just saying for clarity)
take any music source with a volume control and hook to the phone system
use a line on a set and call the main number put yourself on hold
if you hear beeping ,you will need to change the on hold source in programing
if you hear the music ,adjust the volume to make it sound decent on hold
ok now that that is set (DON'T TOUCH THE VOLUME AGAIN)
now take the same source and extend it to your paging amp.
to a volume controlled port ,if the volume is to low for the amp, you will need to get a variable resistor (pot) for the phone system input so that you can turn up the source volume and turn it down into the system
most times the amp can handle it ok
hope this helps
HALLOWED ARE THE ORI
mike