you will have more than 2 wires but on a master socket you only use 2, (blue with white trace/ and white with blue trace)a master socket is one that has a capacitor in it, usually the front plate splits in two with the bottom half plugging/screwing into the top half, the third orange wire is used if your not using a master socket on your extension ,its purpose is to allow the phone to ring, you will still get a dial tone with just the two wires it just wont ring