Shelly 1 intercom wiring

Hi guys,

I have a TCS IVH2100 I want to make smart, so I can detect with shelly, when someone is ringing at my door, and I can let them in.

I really like to old Nello.io device, but you can't buy it anymore. So my idea was to do it with the Shelly 1.

My intercom has outputs called: A B E P M K V1 V1 (V1, V2 I guess is the video feed), By using the nello app I figured out A B is the N, L

But do any of you know what SW, 0 I should be?

/Tue