What is the purpose of the doorbell, which allows my monitor to be connected?

What is the purpose of the doorbell, which allows my monitor to be connected?

The doorbell has two wires (BELL, GND) that go to the entrance button to the home itself so that the monitor plays a different bell if it is called from the outdoor panel or from the doorbell of the home itself, so that we know that the visitor has already arrived at our door.


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