I currently have five telephone handsets in my place, four are cordless units, the other being hard-wired for power outages. Soon, though, my internet connection will be FTTN or possibly FTTP depending on what the providers can get working. There's provision for a single phone using VOIP into the new modem, so I'll ditch all those phones & replace them with a quad cordless setup. The main base station will connect via VOIP and the three extensions will connect to that base.