Connecting Came BPT AS C/251 to Ring Intercom

Good morning, I would need help on how to connect Ring Intercom to my Came BPT AS C/251 intercom. I have contacted email support but they have not yet been able to tell me how to connect the cables to my intercom, I only got a positive response in terms of compatibility.On the official guides my intercom is not listed.In my intercom there are 4 incoming cables and they connect to numbers 6-7-8-9Thank you for your help!