Thank you for the response. So I can effectively just short the relevant pair of terminals on the Panasonic doorphone card to initiate the ringing (assuming the PBX is programmed appropriately.) No need for a resistor in the circuit?
I have a KX TA624 and would like to be able to have the extensions ring when a door bell is pressed. I do not need to be able to talk to the person at the door or open the door remotely. Wiring to the door is difficult, but I have found a wireless bell system that offers a set of relay...
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