I bought a phone jack with four terminals labeled "G" (green), "R" (red), "Y" (yellow), and "B" (black).

However, none of the wires in the telephone cable in the wall have those colors.

See the photo at:

http://i1201.photobucket.com/albums/...pskzoysgzj.jpg

Which wire do I attach to each terminal in the phone jack?

Thanks in advance.