Since 1982, the
maintenance and repair of telephone wiring and equipment inside
a customer's building has been the responsibility of the customer. That
means all of the telephone wires and telephone equipment on the customer’s
side of the demarcation point, where the telephone wires enter the
house, apartment or business, are no longer the responsibility of the local
If you call
the telephone company to come repair your telephone and the company finds
that the problem is on your side of
the Network Interface Device (NID), you will be charged for the service
call whether you choose to have the company do any repairs or not.
So how does a customer know whether the problem is
with his wiring or the company's? The NID is designed so the customer can determine whether
the problem is with his lines or the company's. Check out http://www.homephonewiring.com/ for a
layman's guide to home phone wiring.