I'm really gonna demonstrate my ignorance now, but here goes... My elderly mother lives in an apt that adjoins our house. The apt has a separate phone line from our house though at the moment the line is not active because she uses a cell phone. The phone line from the pole drops to a box mounted on the exterior wall and there is a snap in plug and four screws for each line. I thought that if I put little jumpers from the screws on our side to the screws on her side I would make her inside phone jack active so I could install an emergency medical alert device for her. But it didn't work. Can I piggyback her jack onto our land line somehow?