Wiring the Ring Intercom with a BPT Agata Video Handset

Dear all, Please could you help. I have a BPT Agata video handset in my building. When I was looking at the ring intercom, 2 reveiwers said despite it being 'unsupported', the ring intercom does support it for audio and unlock, just not video. The problem is, I can't for the life of me find which cable to use and what to wire into where. I've seen a few replies on this community that also mention it works. Does anyone know how to wire it up? Many thanks!