Sounds easy enough.....

What you got? One line on Yellow and Black, One line on Red and Green?

Lets say this is your line

------------------------------Red
#####################-----------
#####################Green
#####################-----------
#####################Yellow
#####################-----------
#####################Black
#####################-----------
------------------------------

that runs into your box
Switch ==>|<==Switch
:------------:
:.................:##################
:------------: ^ Line to phone
^switching box

Man this is a bitch on UBB....

so in the box when you flip the switch one way it should connect yellow and black to the line going to the phone. The other way red and green.

You could do this with a switch from a hardware store and some plywood.
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