Connecting Came BPT AS C/251 to Ring Intercom - Ring Intercom - Ring Community

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 6-7-8-9 Thank you for your help!

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