Automatic private branch exchange apparatus

Details Automatic private branch exchange apparatus Automatic private branch exchange apparatus

1995-07-05

1997-07-22

Zele, Krista M.

Telephonic communications

Centralized switching system

Switching apparatus for connecting calling line to...

379265, 379234, H04M 300

Patent

active

056510624

ABSTRACT:
An automatic private branch exchange apparatus controls connection between office lines and extension lines, respectively. The apparatus executes automatic calling to the office lines based on stored telephone number data in the telemarketing or the like. When, for example, one of the office lines responds to the calling, that is, a called party offhooks a telephone handset, the apparatus automatically selects one of the available extension lines and sends a ring sound request signal into the selected extension line. When the selected extension line responds, that is, an off-hook signal is sent through this extension line, the apparatus establishes connection between these responded extension and office lines.

REFERENCES:
patent: 4599493 (1986-07-01), Cave
patent: 4866758 (1989-09-01), Heinzelmann
patent: 5185742 (1993-02-01), Bales et al.
patent: 5463685 (1995-10-01), Gaeschter et al.

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