In the intercom system (Biticino) we have one guard unit 4 nos. (p1, p2, ground floor, and main entry) of outdoor unit and 300 nos. of flat receivers. From the p1 outdoor unit and main entry outdoor unit to guard unit and flat receivers units are working, but from p2 and ground floor outdoor unit they can't communicate with guard unit and flat receivers. How can I take the backup from this device to fix these problems and how to configure both outdoor devices?