Telephone cabling is all made of pairs, each pair is color code into 5 groups with 5 pairs in each group. The total (25 pair) is put together into a binder. Larger cables are made up of many binders with the same color codes, and each binder is identified with the same color code.
There are two sets of colors, primary and secondary. The first pair we get is white/blue. This should be a white wire with a blue tracer (stripe) on it and a solid blue wire with a white tracer. Some cables may not have the tracers as explained above, so you need to carefully cut back the cable far enough to maintain the 'twist' in the pair so you have the right combination. Assuming you have a 4 or 6 conductor jack with the older color codes on it and you are using twisted pair wire, here is how you hook it up in USOC fashion for up to three lines:
white with blue stripe (tip) goes to green
blue with white stripe (ring) goes to red
white with orange stripe (tip) goes to black
orange with white stripe (ring) goes to yellow
white with green stripe (tip) goes to blue
green with white stripe (ring) goes to white
Quad wire (four conductor, hence the name) and the larger 6 conductor station cable (with white and blue) and 8 conductor (with orange and brown) should really not be used as there is generally no twist to maintain signal on each pair.
Here is a link to a pretty good page showing the details:
I'm sure violet/red was just an example, but you probably won't find that comgination. The page is nice because it give you color code and pin out details for several services.
Hope that helps, Good Luck!
It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com