Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2004-10-20
2009-02-24
Chan, Wing F (Department: 2619)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S401000
Reexamination Certificate
active
07496089
ABSTRACT:
There is disclosed a private branch exchange in which an SIP terminal is capable of receiving great variety of services provided by the private branch exchange without upgrading version of software of the SIP terminal itself. A standard SIP protocol control module17and an expanded SIP protocol control module18are disposed for SIP corresponding terminals, convert signals from an SIP system protocol corresponding terminal into signals of a protocol inside an IP-PBX 1 to transmit the signals to a PBX basic connection process providing module12, and convert signals from the PBX basic connection process providing module12into signals of an SIP system protocol to transmit the signals to the SIP system protocol corresponding terminal. A PBX additional service providing module11and the PBX basic connection process providing module12provide additional services in response to an hooking operation from the SIP corresponding terminal or an input of a number for starting the service.
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B2BUA: Enabling Class 5 Capabilities in SIP Designs, www.commsdesign.com/printableArticle/;jessionid=OWFEQBYQHXCDIQSNDBGCKHSCJUMEKJVN?articleID=16502048 Mar. 18, 2005.
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Hiroshima Takanori
Takai Minako
Chan Wing F
Choi Eunsook
Foley & Lardner LLP
NEC Corporation
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