Telephone station make-busy circuit

Details Telephone station make-busy circuit Telephone station make-busy circuit

1975-09-24

1976-12-14

Cooper, William C.

H04M 342

Patent

active

039977358

ABSTRACT:
A telephone central office trunk utilized for establishing connections of calling telephone station lines with a called telephone station line is arranged to enable a subscriber to make a called telephone station appear busy to incoming calls. The trunk is provided with apparatus arranged to respond to the momentary appearance of a low impedance across the called telephone station line in response to ringing signals applied thereto by opening the established connections and applying busy tone to the calling telephone station lines.

REFERENCES:
patent: 3673339 (1972-06-01), Korn
patent: 3777067 (1971-12-01), Kilby

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