Telephonic communications – Call or terminal access alarm or control – At switching center
Patent
1986-03-06
1987-09-01
Schreyer, Stafford D.
Telephonic communications
Call or terminal access alarm or control
At switching center
379188, H04M 166
Patent
active
046913467
ABSTRACT:
The disclosed PBX integrity arrangement utilizes a specialized processing operation to provide an integrity check for communication devices and trunk facilities connected to a PBX. The integrity check determines (1) whether a user of a device or a trunk facility is permitted access to one or more PBX operations or (2) whether the PBX operation meets expected conventional PBX call establishment conditions. If access is prohibited or an atypical condition is present, this access or condition may indicate permission tampering, device or trunk facility misuse, malfunction or unauthorized PBX user activity. The occurrence of any one of the above conditions produces an immediate response which either remedies the occurrence or provides notification of the occurrence of the condition to a PBX administrator.
REFERENCES:
patent: 3996425 (1976-12-01), Low et al.
patent: 4064372 (1977-12-01), Altenburger
patent: 4096356 (1978-06-01), Burtness et al.
patent: 4485437 (1984-11-01), Kinghorn
patent: 4517554 (1985-05-01), Moser et al.
patent: 4523183 (1985-06-01), Frick
patent: 4536748 (1985-08-01), Tonello
American Telephone and Telegraph Company
AT&T Information System Inc.
Duft Donald M.
Schreyer Stafford D.
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