Residential Wiring of Phone Jack

[atlantahight]

I am replacing a residential telephone jack and cannot understand how to hook up the wires.  The age of the line wires and the old jack is around 30 years. There are 8 wires in the incoming line and the old jack only used 4 of them: Green, Purple (or Red), Blue and Orange.  The new jack has 6 minute contacts for the outlet line (to the telephone), but it has only 4 connection screws on the back: Green, Red, Blue and Yellow. Please advise which line wire goes on which of the jack inlet screws.  If the answer is to match the colors, then how about the Orange on the line and the Yellow on the jack?
Bill

[JP]

A standard residential phone line only requires 2 wires. Check and see what two conductors are hooked up to your phone company demark, and hook up the same ones to red and green on the jack.