Need to add another line to an existing 4 line phone junction box. Need wiring help.?

Question

Have 4 lines from different rooms connecting blue wire and white with blue stripe wire in series finally ending with a black and yellow wire at a 2 jack junction box. I tried to wire another room using the blue and white wires only at both ends of the wire, but the phone doesn't work.

Answer 1

I can't picture your wiring, but white/blue goes to green blue/white (blue with white stripe) to red. polarity shouldn't matter. But telephones do not like being in series, should work in theory but it gets weird. Try using a different pair of wire in that cable. All it should be looking for is a continous pair of wires.