So I got out the meter and plugged my previously mentioned 1/8" cable into the MOH jack. The reason you can't read continuity is because there IS NONE!!!

Now start at the beginning of this thread. Do you have output from the music source on the TIP and SLEEVE of a 3.5 mm MONO jack? Oh, that's all there is on a MONO jack :-)

Plug it into a source, turn it on, plug it into the system and go to the main phone and press 1.
The display will say BGM On. If it doesn't, go into programming, dial 626 and press SP PHONE twice. It better say BGM Control #01:Enable.

Carl

P.S. Nobody "loses" two CD's. Either you never had it or you are probably not cut out for phone work. And I believe everyone here has the link.