Electronic private branch exchange

Details Electronic private branch exchange Electronic private branch exchange

1988-12-22

1990-07-10

Brown, Thomas W.

Telephonic communications

Plural exchange network or interconnection

Interexchange signalling

379252, 379396, H04M 302

Patent

active

049411713

ABSTRACT:
An electronic private branch exchange having a function to cause a plurality of particular extension telephone sets to simltaneously respond to an incoming signal from the corresponding one of a plurality of main wire trunks. The exchange is capable of changing an extension telephone set at which an incoming signal tone is to be produced, in accordance with a time zone as needed. When there is an incoming signal from a main wire trunk, extension telephone sets to perform an incoming signal processing are searched from a first memory. A time zero in which an incoming signal tone is to be sent to the searched extension telephone sets is read from a second memory. If the read contents of the second memory and those of a third memory coincide, an incoming signal processing is performed, accompanied by a transmission of an incoming signal tone to those extension telephone sets. The contents of the third memory can be changed by a certain extension telephone set.

REFERENCES:
patent: 4286118 (1981-08-01), Mehaffey et al.
patent: 4694483 (1987-09-01), Cheung
patent: 4707853 (1987-11-01), Hasegawa
patent: 4734933 (1988-03-01), Barsellotti et al.
patent: 4744103 (1988-05-01), Dahlquist et al.

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