Telephonic communications – Call or terminal access alarm or control – At substation
Patent
1992-09-15
1995-11-28
Hofsass, Jeffery A.
Telephonic communications
Call or terminal access alarm or control
At substation
379199, 379188, H04M 166
Patent
active
054715245
ABSTRACT:
An apparatus for restricting telephone calls. The apparatus is wall mountable and can be powered by power available from a telephone line equipping a facility. Visually, the device emulates the appearance of a standard in-wall telephone connector package, with the electrical components of the device concealed with the facility wall. A programmable processor is incorporated into the apparatus allowing the user to override restrictions, enter new restrictions, or change the security code through entry of digits from a standard tone or pulse dialing telephone. Use of linear logic protocol in programming reduces complexity of programming and probability of error. The device temporarily disconnects the telephone from the network as each programming sequence is completed, preventing a tie-up of the network and reducing the probability of an accidental establishment of a local or long-distance connection. A PLX option circuit isolates the telephone line connected to the restrictor outlet, preventing a user of the telephone from eavesdropping on calls made from another telephone on the same line.
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"Call Control", Hello Direct Catalog, 1991, pp. 38, 39.
Colvin Donald G.
Reynolds Peter
Colvin Donald G.
Hofsass Jeffery A.
Hunter Daniel S.
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