VIZIT - Intercom

Hello

I’m trying to set up a Nuki Opener with an VIZIT intercom system and wasn’t sure if you’ve ever worked with something similar.

It looks somewhat related to this discussion, but the board I have isn’t exactly the same. I tried following the steps described there, but it doesn’t quite match, and I was hoping you might be able to share some guidance or point me in the right direction.

Thanks a lot for your time!

What I have figured out

State Voltage (V)
Idle ~ 0.1
Incoming call (no ringing) ~ 1.7
Incoming call (ringing) ~ 4.5

Opening door

Second important thing that I found - that breaking circuit while intercom have incoming call will make door open.

Image of the board