The only difference in the color coding between telephone cable (the stuff used outside and strung along poles or underground in conduit) and telephone inside wiring (the gray colored stuff in the walls and up in the ceiling) is that the inside wire has each pair traced with the color of its mate.
It's worth emphasizing that point for anyone who hasn't worked on telephone plant. Many cables have just solid-color insulation, no bands or tracers, so you rely on the twisted pairs to identify each circuit, e.g. #3 will be a plain white (tip) and a plain green (ring) wire.
The problem comes when somebody new decides to untwist all the pairs to "help" and you're left with five wires of each color, none matched up with its mate!
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