On the phone side of things, routers exist that include not only a built-in ATA, but also built-in DECT base-station.
Any ATA can be "plumbed" into your legacy phone wiring provided your phone wiring is disconnected from your Telco. This way your jacks around the house still have dial-tone, but coming from your ATA rather than POTS from your Telco. In case of ATA failure, make sure your incoming line can be patched back to your legacy phone wiring to by-pass a broken ATA. Yuri
