Communication apparatus with private branch exchange for communi

Details Communication apparatus with private branch exchange for communi Communication apparatus with private branch exchange for communi

1991-10-16

1993-03-02

Dwyer, James L.

Telephonic communications

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

With exclusion or priority feature

379100, 379156, 379210, 379216, 379355, H04M 100, H04M 1100, H04M 342, H04M 300

Patent

active

051916045

ABSTRACT:
A communication apparatus includes an extension-line connector to be connected to a private branch exchange, an external-line connector to be connected to external lines, and a plurality of independently operable communication control units. When an attempt to perform a communication with an external station is made in a situation in which the external-line connector is already being used for a communication with another external station, the attampted communication with the external station is effected via one of the plurality of communication control units which is not in use, the extension-line connector, and the private branch exchange.

REFERENCES:
patent: 4564724 (1986-01-01), Nakayama et al.
patent: 4575584 (1986-03-01), Smith et al.
patent: 4825463 (1989-04-01), Miura

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