Telephone answering system and apparatus for direct caller selec

Details Telephone answering system and apparatus for direct caller selec Telephone answering system and apparatus for direct caller selec

1989-10-02

1992-02-04

Schreyer, Stafford D.

Telephonic communications

Polystation line system

Call alerting

379182, H04M 172, H04M 1300

Patent

active

050864580

ABSTRACT:
With a plug-in tone responsive unit at each extension, a central answering unit responds to a caller initiated, telephone company generated, ring signal on the telephone line and establishes a connection with the calling phone. Each of the remote units responds to a different predetermined tone frequency. When the caller pushes a key on a standard Touch Tone phone key pad to select a specific extension, the responding remote unit generates a ringing signal for that extension.

REFERENCES:
patent: 4675899 (1987-06-01), Ahuja
patent: 4701949 (1987-10-01), Lynch et al.
patent: 4723271 (1988-02-01), Grundtisch
patent: 4741024 (1988-04-01), Del Monte et al.
patent: 4910764 (1990-03-01), Bowen
patent: 4926467 (1990-05-01), Meier
patent: 4974253 (1990-11-01), Hashimoto

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