Brian -

I've held off replying because I don't know jack about the system, but apparently neither does anyone else, so.......

Here we go.

Exactly what are you trying to accomplish?

Terryphones, both the Intercom and the key system versions were very proprietary and if you didn't work for the manufacturer, you didn't work on them - at least back in the day.

Are you trying to access a paging function on the ICM from the telephone system? Is there an external amplifier?

Enquiring minds want to know.

Sam

"Where are we going and why are we in this hand basket?"