Universal line status monitoring and response system

Details Universal line status monitoring and response system Universal line status monitoring and response system

1987-10-29

1989-06-13

Schreyer, Stafford D.

Telephonic communications

Emergency or alarm communications

Central office responsive to emergency call or alarm

379 33, 379 49, G08B 2600, G08B 108, H04M 1104

Patent

active

048399175

ABSTRACT:
A system is disclosed for monitoring telephone lines by bridging across each line between a telephone central office or private branch exchange (PBX) and a telephone set. The lines are scanned periodically for OFF-HOOK, DIALING or IN-RING condition to determine line status. OFF-HOOK without DIALING or IN-RING condition for more than a preselected period is considered one form of an alarm condition. Dialing signals of certain predetermined numbers is considered an alarm. A computer is provided to store line status information, preset numbers, personel identification (PIN) numbers and telephone set locations to provide a universal software controlled monitoring of locations, telephone sets and personnel whereever telephone sets are located.

REFERENCES:
patent: 2195627 (1940-04-01), Lomax et al.
patent: 3571531 (1971-03-01), Rubin
patent: 3917915 (1975-11-01), Karras
patent: 4273960 (1981-06-01), Fahey et al.
patent: 4692742 (1987-09-01), Raizen et al.

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