Multiplex communications – Wide area network – Packet switching
Patent
1993-02-25
1995-04-25
Hsu, Alpus
Multiplex communications
Wide area network
Packet switching
370 61, 370 79, 3701101, 379 94, 379211, 379234, H04J 312, H04M 342, H04M 700, H04M 1100
Patent
active
054105390
ABSTRACT:
A PBX incorporates a table for storing information indicating whether a calling mode of each extension terminal designates an extension or a trunk. Upon reception of an incoming call from an ISDN, the PBX checks whether a calling party number is included in the "set-up" message. If a calling party number is included, the PBX checks the calling mode of an extension terminal as a called party by referring to the table. If the default designates an extension, the PBX adds a trunk access code to the calling party number in the "set-up" message, and sends the resultant number to the terminal as the called party. If, therefore, the terminal which receives the incoming call has a function of generating a call to the party of the stored calling party number, the terminal can generate an outgoing call regardless of whether the calling mode of the terminal designates a trunk or an extension.
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Canon Kabushiki Kaisha
Hsu Alpus
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