Installing Ring Pro with my existing M&S System Intercom MC170

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!