Looking to power a Panasonic KX-T7030 locally for a customer since a DSL tech "used" one of the phone extension pairs to feed the DSL modem. There is no local transformer jack on the phone itself. If I just inject the required voltage on the correct pair at the phone, will that work, or is there also some phone system data on the same pair? It has been a few years since I've dealt with a Panasonic system, and probably would have been unsure then laugh