Some time ago, I installed conduit and pulled CAT5 underground from a utility building - 250' in one direction to his office, and 250' in another direction to his house.

Now he's had the phone line installed (aerial - about a mile) to the utility building. I've got dial tone at both the house and the office.

He wants a way to signal from the office to the house if the call is for his wife, and vice versa!

I'm stuck! Any ideas? Can I use another pair and have 2 line phones at each end? No dial tone, but how do I ring?

Thanks!

Grov