Telephone hold circuit

Details Telephone hold circuit Telephone hold circuit

1980-08-07

1982-12-21

Brigance, Gerald L.

179 81R, H04M 100

Patent

active

043651178

ABSTRACT:
An electronic hold circuit for a telephone which is actuated by a hold command signal produced by a momentary depression of the telephone hook switch. The hold circuit is connected across the telephone lines and includes circuitry for discriminating between a hold command signal present on the telephone lines and dialing, ringing and hand-up signals. When a hold command signal is detected, a holding impedance is connected across the telephone lines thereby maintaining the connection at the central office.

REFERENCES:
patent: 3629514 (1971-12-01), Flamini, Jr.
patent: 3848094 (1974-11-01), Russell
patent: 3895192 (1975-07-01), Angner et al.
patent: 4093829 (1978-06-01), Silbenman
patent: 4219701 (1980-08-01), Feiner
patent: 4232199 (1980-11-01), Boatwright et al.

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