I had wiring problems with my house, so I temporarily plugged the cordless phone base into the good jack, and used it, and 2 cordless phones throughout the house. I have come to realize there is no reason to fix the wiring. I am looking hard at purchasing a new cordless base which has 4 handsets at Costco. Many come with the option to buy as many add on handsets as you wish. You can put the charging bases (plug into the 110v outlet) anywhere in the house, and it all works off the one base station. All you need is one good jack in the house. I think the base station and 4 phone set was about
140bucks.This may not be an answer for everyone, but I figured why fix the wires, when I can just expand the technology that I am already using.
I am not talking cellular, this is the common cordless in-house units that you plug into your landline.
One warning, this system goes DOWN if you lose power, as do all cordless phones (that I know of, perhaps there are battery backed up base units that I am not aware of) it would be a good idea to keep an old-school basic phone around, if only to plug into the wall jack in the event power is lost. The old style ringers are powered by the phone line, and will still ring. Many, although not readers of this group, may not realize if you have all high tech phones in the house, the will go out in a power outage, they may still have dial tone, but have no power to operate the ringer. That may not be a huge problem if you have a cell phone, but it is something you should be aware of, as it is rather disconcerting to be at work, learning the power is out at your home, and you try to call to see if everything is OK, and it sounds (to the caller) like the phone is ringing, but in actuallity, in the home, there is no ringer going off, so people are home, but have not idea the phone is "ringing".