Private automatic branch exchange system with line accessing num

Details Private automatic branch exchange system with line accessing num Private automatic branch exchange system with line accessing num

1989-05-02

1991-04-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 581, 370 60, H04J 302, H04J 312, H04J 308

Patent

active

050088840

ABSTRACT:
Disclosed is a PBX system connected through a communication line (61) to an ISDN public network (101), comprising a control unit connected to a PBX switching network. The control unit comprises a unit for adding a line accessing number (.alpha.) to a calling party address (#B) in an incoming call information (ii) received through the communication line so as to form an incoming information (iii) to be received by said extension terminal, and a unit for transmitting the incoming information including the line accessing number to the extension terminal in which the line accessing number is displayed, whereby the user can recognize whether the incoming call is from the ISDN public network or from another extension terminal accommodated by the PBX system.

REFERENCES:
patent: 4125745 (1978-11-01), Steidl
patent: 4788682 (1988-11-01), Vij et al.
patent: 4805171 (1989-02-01), Ewell
patent: 4866704 (1989-09-01), Bergman
patent: 4888766 (1989-12-01), Ogasawara

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