Just FYI, the Blue pair will always be in the middle in both A or B as it's only the orange/green pairs that are changed between the two. So regardless of whether you use A or B, if your phone wiring is done correctly, you can plug an RJ-11 into an RJ-45 jack and hit the blue pair in the RJ-45.
We frequently use Cat5e/6 here at work for phones and in some cases, terminate to a BIX block with RJ-45's on them too. Then we can plug a phone into it if need be. This is handy for analog lines for say, fax machines.
We've also worked used this method in rooms with no phone lines that suddenly require one. To use a network cable, at the wiring closet end you simply use an RJ-11 in the patch panel and punch the other end into a BIX block.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.