The only problem is when you terminate voice jacks in 8-pin "B" and cut the cable down on 66 or 110 (or bix, eh?). Now the 2-pair voice line is blue-green instead of blue-orange.
For those of us who are old AT&T guys we're used to that, especially when installing a Partner that uses two pair. You'll frequenty see it in old business that started out with a Merlin or Definity. Like Ed said, that's where 568B was born. You'll save yourself a lot of trouble by pulling a jack off the wall and looking at it before jumpering all other ends. Better yet, replace the jacks.
-Hal
