Telephone apparatus with conditional operation

Details Telephone apparatus with conditional operation Telephone apparatus with conditional operation

1991-04-19

1993-11-30

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379183, 379160, 379165, H04M 100

Patent

active

052673065

ABSTRACT:
A dial controllable conditionally operative device which is directly connectable to the ring and tip lines of a subscriber loop. "On-hook" coupling is provided to allow the device to provide the conditional operation of one or more of the functional capabilities of a standard telephone. The device is usable in parallel with at least one standard telephone to provide a controlled telephone system. The device may also be usable in an intercommunication system using the ring and tip lines of the subscriber loop.

REFERENCES:
patent: 4636589 (1987-01-01), Lee
patent: 4754476 (1988-06-01), Rasmussen et al.
patent: 4769837 (1988-09-01), McCormick et al.
patent: 4893334 (1990-01-01), Parnello

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