Cordless key telephone system having zone switching function

Details Cordless key telephone system having zone switching function Cordless key telephone system having zone switching function

1994-01-27

1995-09-26

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, 379 59, 379 60, 379 63, H04M 1100

Patent

active

054540283

ABSTRACT:
In a cordless key telephone system for servicing separate service zones (3.sub.1, 3.sub.2), a cordless station (5) establishes a two-way radio channel with an access unit (4) of the service zone in which it is located, and constantly monitors the field intensity of the established channel and transmits a zone switching signal when the field intensity is below a specified level as an indication that the cordless station is leaving a first zone (3.sub.1) and entering a second zone (3.sub.2). A main controller (2) establishes a switched connection between exchange lines (6) and the access units (4). In response to the zone switching signal from a given cordless station via the access unit of the first zone, the main controller holds an exchange line (6.sub.i) that is connected to the access unit (4.sub.j) of the first zone through a first switched connection, and establishes a second switched connection between the exchange line (6.sub.i) and the access unit (4.sub.j) of the second zone, instead of the first switched connection. A vocal announcement is applied to the exchange line indicating to a communicating party that the cordless station is switching zones.

REFERENCES:
patent: 4748655 (1988-05-01), Thrower et al.
patent: 4926421 (1990-05-01), Kawano et al.
patent: 5111535 (1992-05-01), Tokunaga
Patent Abstracts of Japan, vol. 004, No. 145, 19 Jul. 1980.
Ericsson Product Brochure for CT3., Feb. 1990.

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