Years ago, we installed an Inter-Tel Axxess for a rather large tech company. They did their own wiring and insisted that voice be put on patch panels.
Tried to convince them to run all Cat 5 (at the time) so any jack could be used for voice or data, since they were using patch panels. Nope, they used Cat 3 for voice.
The guy wiring the patch panels wired them as B, because "everyone knows that patch panels are B". The guy doing the jacks wired them as A, because "everyone knows that voice is A".
Since the Axxess system used pins 3 and 6, none of the phones came up. Fortunately, the guy doing the jacks left enough slack to rewire them. About a hundred of them, if I remember correctly.
