Programmable toll restrictor

Details Programmable toll restrictor Programmable toll restrictor

1973-08-08

1976-02-24

Cooper, William C.

179 27CB, H04M 338

Patent

active

039405699

ABSTRACT:
A toll restrictor for use in determining whether attempts to complete a trunk call are unrestricted is responsive to at least a first successively dialed three digit code of the call from the trunk to provide a control signal in response to this code being a restricted code to prevent the completion of the call having this code. The restrictor includes a registration portion which comprises relay means responsive to the dialed digits for initially registering the first two successively dialed digits of the code as a first tens digit group and the last successively dialed digit of the code as a second ones digit group. The first tens digit group enables the provision of a family of ten three digit codes having a common first two dialed digits. The registration portion also comprises second relay means responsive to at least the first tens digit group for providing the control signal when at least the tens digit group indicates a restricted three digit code. Only a portion of the three digit codes in a family of such codes can be restricted by the interposition of a relay means, such as a reed relay means; which is operable in response to the provision of at least one unrestricted three digit code in a restricted family of such codes to prevent the operation of the second relay means when the reed relay means is operated. The toll restrictor may also include means operatively connected to the first relay means which are responsive to the first provided digit being a predetermined digit, such as a unique long distance access code, for resetting the toll restrictor to the initial state thereof in response thereto.

REFERENCES:
patent: 3692951 (1972-09-01), Hestad et al.
patent: 3784757 (1974-01-01), Woolf

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