Multiplex communications – Wide area network – Packet switching
Patent
1986-09-05
1988-08-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, H04J 302
Patent
active
047649194
ABSTRACT:
A virtual PBX capability is provided to a group of user packet stations served by a packet switching system. The system establishes a virtual circuit between each distinct pair of stations in the group. The stations exchange signaling packets via the virtual circuits and respond to such packets by coordinating the initiation and disconnection of voice, data, or image calls. All call processing, including the provision of features such as call forwarding and automatic callback, is accomplished by the stations without the aid of the switching system. A fraud prevention mechanism is included in the switching system to prevent unauthorized stations from communicating as part of the virtual PBX group.
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J. E. Harley, "No Kidding, No Cabinet", Telephone Engineering & Management, Feb. 15, 1983, pp. 78-79.
M. Kajiwara et al., "Consideration on Call Processing Function Distribution to Subscriber Terminal", IEEE Transactions on Communications, vol. Com-27, No. 8, Aug. 1979.
D. L. Huebner, "Intelligent Telephones and Generic Switching: A Distributed Processing PABX Architecture", ISS '84 Florence, May 7-11, 1984, pp., vol. 2.
W. N. Stout, "New `Switchless` PABX Uses Coax, FDM to Offer Voice, Video, Data, Control", Telephone Engineering & Management, Mar. 15, 1976, pp. 86-87.
Hunter Paul D.
Parker William W.
Widrevitz Benjamin C.
American Telephone and Telegraph Company AT&T Bell Laboratories
Jung Min
Olms Douglas W.
Watland Ross T.
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