Toll restrictor for a time division telecommunication system

Details Toll restrictor for a time division telecommunication system Toll restrictor for a time division telecommunication system

1976-01-26

1977-09-06

Cooper, William C.

H04M 166

Patent

active

040469654

ABSTRACT:
A toll restrictor is disclosed for use with a time division multiplex telephone switching system. The restrictor disclosed may serve an entire exchange, the restrictor having digit storage capability for each time slot used. The restrictor is capable of refusing or accepting a first digit and as many as six additional digits in the form of codes. Decisions by the restrictor are made on the basis of conditions programmed within the restrictor apparatus. Calls are completed or not depending on the decisions of the restrictor.

REFERENCES:
patent: 3671677 (1972-06-01), Lee et al.

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