Toll restricting method and apparatus

Details Toll restricting method and apparatus Toll restricting method and apparatus

1975-05-05

1976-09-14

Cooper, William C.

H04M 166

Patent

active

039808360

ABSTRACT:
The invention is a toll restricting method and apparatus which restricts toll telephone calls from telephone stations by interrupting dialing sequences if from the station there is dialed (a) a restricted digit during a first predetermined number of digits, or (b) more than a second predetermined number of digits. Restricted dialing sequences are interrupted by disconnecting the telephone from the central office line for a period sufficient to release all the registered digits and to return central office dial tone to the telephone. Also provided are a method and apparatus for allowing absorb digits to be dialed before the counting of digits begins. A method and apparatus are additionally provided for restricting a telephone from which delays between digits dialed are greater than a predetermined time delay.

REFERENCES:
patent: 3851109 (1974-11-01), Downs et al.
patent: 3872260 (1975-03-01), Oatis
patent: 3899640 (1975-08-01), Pieacente et al.

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