There was nothing wrong with the old handset just ugly! So replaced it checked with intercoms r us and they said the comelit handset was compatible yes their are 3 black wire 1 was separate and 2 together I can hear through the intercom but no sound from handset when I speak and no sound from...
Have just replaced my intercom handset with a comelit 2602 but can hear or speak to any one at the buzzer I have wired it up in the picture is this correct ! Door can open buzzer works just no microphone