Telephone answering device with direct telephone line interface

Details Telephone answering device with direct telephone line interface Telephone answering device with direct telephone line interface

1992-11-24

1997-02-25

Matar, Ahmad F.

Telephonic communications

Audio message storage, retrieval, or synthesis

Dynamic audio signal recording or reproduction

379 72, 379412, 379437, H04M 164, H04M 100

Patent

active

056065981

ABSTRACT:
A telephone answering device with a direct telephone line connection eliminates the need for a transformer, optoisolators and relays that are normally used in telephone answering devices to isolate the telephone answering device system from the central office circuit. Isolation is instead achieved directly at the exposed metal points of the system by physical isolation, switched isolation, resistive isolation and dielectric isolation.

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