phone extension

gbh

I am trying to connect an extension from master socket.
Cable from master socket are red, blue, white/blue and white/red, extension colours are red, blue, white and green. How do I match extension colours to master colours???
HELP

Buzby

There is no standard. Simply look at the colours on the extension socket (assuming pre-wired) and connect the colours from pins 2, 3 & 4 to the same numbered ports on the NTE 5 plate.