I have two lines. The wall socket has one socket and a wire coming out from under the plate to a small box with a second socket. That one is line two. Using separate analog phones both lines work fine. Using my new Vtech (VT2960) two line plus data port digital phone, line two does not work. Line one is plugged into L1/L2 and line two is plugged into L2 but I get no dial tone on line two. The phone works perfectly in other rooms plugged into a two socket wall plug with separate lines and also works fine using a one socket wall plate wherein it is wired for two lines and the line is plugged into L1/L2. In both the latter cases both lines work normally. Help.