Matt -

If I understand you correctly, that is exactly what you want to do. The 410PA card doesn't care whether it gets a burst of signal from the 601s Icm or the C19 or from......anything else. As I recall (and it's been a real long time [30+ years]) It recognizes the signal and throws the ICM T&R onto the PA system input (muting the bgm too).

Recognize that the glory & perfection of 1A2 was its interoperability. I often installed complete systems that had 6 different manufacturers (KSU from ITT, Intercom from Teltone, Cards from AE, Phones from SC, etc....) There were some notable exceptions but for the most part it all Just Worked.

Sam


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