My home phone arrangement is four cordless Uniden DECT handsets, three on charging bases & one with a digital answering jigger which attaches to the broadband router/modem. Quite neat devices, if I add a number to the phonebook on any handset, the others get updated as well. The same with deleting caller IDs, clearing from one removes it from all. Plus there's a handsfree speaker on the back of each one. For night-time use, the numbers are illuminated when a handset is picked up.
And since there's a second RJ45 socket on the modem, I've been able to connect the kitchen's hard-wired phone via the existing wiring.