Is there not already an RJ-11 located at the demark of nearly every resi demark post 1980 anyway. Most TNI's (those grey boxes most phone companies use as a demark) already contain one as a jumper between terminals.
The problem lays with VIOP where the CATV company is providing telephone service through a modem - that may not work during power outages. Some companies here in CA had to provide a UPS to power the modem initially - but I think that's long gone???
