We use Voice Over IP. The company is conveniently called voip.ms. I connect the device directly into my old in-house wiring. (Using a crossover phone wire and disconnecting my service at the box.) So all the old outlets work. Or you could connect to one cordless phone with several handsets. Or both (which we do).
Since we use the phone very little, the costs are almost negligible. We spend in 4+ months what we used to spend in 1 month with a land line.
This works the same as the VOIP options offered by cable companies. Who charge an absurd amount. $20+ a month as an intro rate? Egads, what a ripoff.
When traveling, we route the “home” phone number to our cell phone. Very convenient.