Private branch exchange

Details Private branch exchange Private branch exchange

1994-12-14

1996-08-27

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

H04J 302, H04Q 1104

Patent

active

055508227

ABSTRACT:
A private branch exchange accommodates a line wire on a network side and a packet terminal and supports an ISDN packet switching service. A first call from the network side or terminal side is detected, and a B channel to perform packet switching for the first call is decided based upon the first call. A B channel assigned for a second call, which was placed prior to the first call, is specified when the first call is detected. This specified B channel is one that is being used in packet switching of the second call. In a case where the B channel that has been decided is different from the B channel that has been specified, negotiation is performed with the network or terminal and the specified B channel is ultimately decided to be the channel that will be used in packet switching for the second call.

REFERENCES:
patent: 5014266 (1991-05-01), Bales et al.
patent: 5051992 (1991-09-01), Taniguchi et al.
patent: 5157660 (1992-10-01), Kuwahara et al.

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