Step one is to determine if it is the phone company or your house. To do
this, go outside and find the box where the lines come in. Inside is a
connector from the house to the phone company. Disconnect the house, plug
in a phone to the interface, see if you have a dial tone. If yes, it is
your problem and expect to pay for the service call.



I don't have a network interface box so there is no telephone plug
where the wires come in. Instead there is what I believe is called a
entrance bridge. I tested for voltage between the green and red
wires. I got 24 volts. I am not sure whether this is within the
range of voltage I should find.