A telephone trouble shooting situation: subscriber`s line to a residence is reported as out-of-service. A test set across the line at the subscriber`s telephone jack indicates no dial tone. A test at subscribers interface with premise wiring connected shows no dial tone. With premise wiring disconnected, the test set proves subcriber`s line is operational at the interface. What is the problem?

A telephone trouble shooting situation: subscriber`s line to a residence is reported as out-of-service. A test set across the line at the subscriber`s telephone jack indicates no dial tone. A test at subscribers interface with premise wiring connected shows no dial tone. With premise wiring disconnected, the test set proves subcriber`s line is operational at the interface. What is the problem?