My front doorbell stop ringing, so I decided to upgrade with the Ring Pro (a reason for me to upgrade my home with a front door camera 
). Unfortunately, my family uses an M&S Intercom system, model MC170, and the installation guide from RING doesn’t seem to teach me how to install it.
So I quickly did some research, and some people say they cannot install with the old home’s intercom system while some say they found a solution.
I am very lost and would be grateful if someone can provide some guidance on the following!
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