URMET 1130/12 WIRING DIAGRAM

Hello, have you managed to connect your intercom 1130/12?
I'm having the same problem, I can't do it at all. If you succeeded, could you tell me how you did it?
Thank you.

I don’t really have any information about the intercom, except that it doesn’t have a separate receiver but has a button to talk and another to open the door remotely. It only says Urmet "Giugiaro Design."

Having taken it apart, no reference is indicated on the casing or inside (but I will check again).

I imagine the previous tenant removed the alert and I would like to instead install a 12V buzzer, but without a wiring diagram, it’s almost impossible. Also more: http://www.comparerdevis.net/travaux_alarmes-securite.htm
All tips and diagrams are welcome.