Explain to the customer that it is not the accepted / standard way of doing it. Then explain that it will most likely work just fine and they could save thousands of dollars and let them decide.

I've seen data cables extended over 2 pairs of a 25 pair Category 3 cable and it worked just fine (it was existing - we didn't do it!).

With a small business sometimes money is tight and something like this goes a long way and if someone comes along later and says you are a hack the customer will know that it was their choice and not blame you.

John Corrigan
New Phone Systems and Service
[Linked Image]