Confusing wiring on intercom

Hi all,
Im trying to wire a generic intercom. I think it is analogue, but it can’t seem to figure out. The contact that opens the door seems to unlatch when the cable is pulled out, leading me to believe that it works by un-shorting the contact. Then again, I have no idea.

I’ve attached a photo of the current wiring and a page I found in a manual. I’ve sent my opener back for now because otherwise I would have been stuck with it. If anyone could advise me what to do to get it working, i’d be forever grateful.