I am trying to help someone whose line 2 went dead after they did some rearranging of furniture. The wiring was pretty old, so I replaced it from where it comes into the wall. There is a two-line phone in that room that has both lines working fine. Between where the line comes in and the jack, the wires are spliced to a second set of wires, which goes into another room. In that room, line 1 works fine, but line 2 has no dial tone. Since both lines work in the first room, I figured the problem had to be in the second room, but now I'm not sure. Questions: 1) is it okay to splice in another set of wires between where the original set of wires comes into the room and the first phone jack? Or should the second set of wires be connected to that first phone jack? Or.. 2) Could the problem be with the phone? I'm not sure how to check the second line as the only other phone available is a one line phone. 3) Am I correct in assuming there is no problem between outside? 4) There is DSL on this phone line too. Since there is a separate cable/wire coming in, it doesn't seem like the phone wires spliced in for the other room should affect the DSL, but it seems that when the non-functioning line 2 is connected in the second room, the DSL stops working. Is this just a fluke or are there special considerations in phone wiring when DSL is present?

Sorry for all the questions. But I really appreciate any help anyone can give me. Thanks in advance.

The problem can be anywhere, I know that is not much help, but need to start over and check all the connections.

A telephone cable usually has 4 wires, red and green for Line #1, and black and yellow can be used for Line #2. The red and green end up at the two center prongs on a 4 wire jack, the other two on the two outer prongs.

To test with a one line phone, make up a test jack by using a spare jack with wires coming off the red and green terminals, and connect to to each set of wires and use the phone to hear the dial tone.

DSL is another signal imposed onto the phone line or number on that set of two wires, and should not affect the operation of that line. You may need the filter provided by the DSL provider in between the phone and jack to eliminate the noise or hiss, but still should be able to hear the dial tone.

I hope this helps some, if not get back with what you found so far, and more detail.