I'll add to that and say CAT 5 or 6 should never be used for voice nor should 8 position jacks (commonly referred to as RJ-45).

This is really a debate between the geeks and the phone guys. Geeks only know patch panels, CAT5 and 8 position jacks, phone guys know better.

This thread should give you a good idea of why I take this position.

-Hal

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