There isn’t much difference between an Ethernet cable and your in-house telephone wire (the RJ-11 jack that your phones use even plugs into most RJ-45 Ethernet ports, albeit on 4 wires instead ...

Then get two female power plugs, connect them to each end of the telephone wire, plug the homeplug adapters into them, hook up the homeplug adapters to ethernet, turn on the power, and it should work.

I've decided to take the plunge and I plan on wiring up my home to have ethernet, cable and voice in each of my bedrooms, ... Recommendations for wiring up telephone lines.