Dahua VTO detect doorbell

[MikeLima 0]

Hi everyone

 

I need to "connect" my Dahau VTO2000 to my home-system. I use the "open door" to detect the open door signal and the tell my home system to open the door (Wireless Switch Detector.

But I really need a way to detect if someone pressed the "ring" button. Does anyone know where I could grab the "signal". I tried to solder 2 wires to the button but there I get only 3.3V-

 

Any help appreciated.

 

MikeLima