Integrated telephone and intercom system

Details Integrated telephone and intercom system Integrated telephone and intercom system

1993-11-02

1996-07-16

Hofsass, Jeffery

Telephonic communications

Multi-line or key substation system with selective switching...

With special service

379159, 379165, 379215, 379373, 379393, H04M 172, H04M 902

Patent

active

055374654

ABSTRACT:
An integrated telephone system is provided, having a connection to a Central Office (CO) line and a connection to at least one secondary line. The CO line and/or the secondary line may be selectively accessed for two-way communication independently of each other and may be signalled for call waiting, call holding, and busy fuction. The accessing and selection are operative through a single subscriber telephone instrument. The entire system circuits are mounted on a single circuit board having pins for connection to common bus for combined use with a plurality of similarly constructed systems assigned to individual subscribers.

REFERENCES:
patent: 4588864 (1986-05-01), Carter et al.
patent: 4631367 (1986-12-01), Coviello et al.
patent: 4759055 (1988-07-01), Okumura et al.
patent: 5027391 (1991-06-01), O'Neill et al.

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