The doorphone you have is what I call a "universal" doorphone since it can work with any loop start trunk port on any system. In your case line 4 is labeled "Door"?

The way to test is actually the reverse of what has been suggested. Connect the doorphone to any single line analog phone or buttset, press the button and see if the buttset or phone rings. I suspect that the ring generator in the controller has crapped out. Time to replace the whole thing.


-Hal

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