Telephone call denial system

Details Telephone call denial system Telephone call denial system

1980-11-05

1982-10-19

Brown, Thomas W.

179 18FH, H04M 166, H04M 338

Patent

active

043552080

ABSTRACT:
A call denial apparatus for identifying a telephone subscriber's line out of a group, whereby access to a trunk is denied in the event the subscriber dials one or a group of predetermined digits. A subscriber not to be denied access to the trunk is identified by applying a tracer signal to the seized trunk and the tracer signal on one of the group of subscribers' lines is detected. Accordingly specially modified telephone sets and lines are not required.

REFERENCES:
patent: 3151219 (1964-09-01), Ellis et al.
patent: 3267216 (1966-08-01), Raab et al.
patent: 3471647 (1969-10-01), Abert et al.
patent: 3521001 (1970-07-01), Pearce et al.
patent: 3787632 (1974-01-01), Male et al.
patent: 4027104 (1977-05-01), Levitt et al.

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