Patents by Inventor Tomohide Sugimoto

Tomohide Sugimoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Internet telephone connection method, bandwidth controller and gate keeper
    Patent number: 7272134
    Abstract: In an Internet telephone connection method, a communication bandwidth is managed by using a bandwidth controller, gateway devices and voice relay routers to monitor communication quality under bandwidth reservation. A communication path under bandwidth reservation is preferentially selected by using gate keepers and the voice relay routers, and the connection of the Internet telephone is performed. A problematic device is prohibited from being selected as a connection-destination device at the time of a call setup and the problem restoration is monitored by using the gate keepers and the gateway devices. Further, a device having invalid attribute information is prohibited from being selected as a connection-destination device at the time of call-setup, and the restoration of the attribute information is notified to the overall network.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: September 18, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Etsuko Iwama, Tomohide Sugimoto, Ryogo Honda, Kansuke Kuroyanagi, Yuichi Mori
  • Internet telephone system
    Patent number: 7154883
    Abstract: In executing a setup procedure of a call from a VoIP gateway on the originating side to a media gateway on the destination side via a gate keeper, an authentication key is transmitted from the gate keeper to the VoIP gateway and the media gateway. The VoIP gateway on the originating side transmits to the media gateway on the destination side an admissions confirm (ACF) after attaching the authentication key. Then, the media gateway collates the authentication key obtained from the originator VoIP gateway with the authentication key obtained from the gate keeper and continues the call setup procedure only when the two authentication keys coincide with each other. On the other hand, in case of non-coincidence, the gate keeper carries out a call release. Through this, an illegal connection call not routing through the gate keeper is excluded without fail.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: December 26, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Hirayama, Kazuhiro Kita, Tomohide Sugimoto
  • Internet telephone connection method, bandwidth controller and gate keeper
    Publication number: 20030235187
    Abstract: In an Internet telephone connection method, a communication bandwidth is managed by using a bandwidth controller, gateway devices and voice relay routers to monitor communication quality under bandwidth reservation. A communication path under bandwidth reservation is preferentially selected by using gate keepers and the voice relay routers, and the connection of the Internet telephone is performed. A problematic device is prohibited from being selected as a connection-destination device at the time of a call setup and the problem restoration is monitored by using the gate keepers and the gateway devices. Further, a device having invalid attribute information is prohibited from being selected as a connection-destination device at the time of call-setup, and the restoration of the attribute information is notified to the overall network.
    Type: Application
    Filed: June 10, 2003
    Publication date: December 25, 2003
    Inventors: Etsuko Iwama, Tomohide Sugimoto, Ryogo Honda, Kansuke Kuroyanagi, Yuichi Mori
  • Internet telephone connection method, bandwidth controller and gate keeper
    Patent number: 6600735
    Abstract: In an Internet telephone connection method, a communication bandwidth is managed by using a bandwidth controller, gateway devices and voice relay routers to monitor communication quality under bandwidth reservation. A communication path under bandwidth reservation is preferentially selected by using gate keepers and the voice relay routers, and the connection of the Internet telephone is performed. A problematic device is prohibited from being selected as a connection-destination device at the time of a call setup and the problem restoration is monitored by using the gate keepers and the gateway devices. Further, a device having invalid attribute information is prohibited from being selected as a connection-destination device at the time of call-setup, and the restoration of the attribute information is notified to the overall network.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: July 29, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Etsuko Iwama, Tomohide Sugimoto, Ryogo Honda, Kansuke Kuroyanagi, Yuichi Mori
  • Internet telephone system
    Publication number: 20030123434
    Abstract: In executing a setup procedure of a call from a VoIP gateway on the originating side to a media gateway on the destination side via a gate keeper, an authentication key is transmitted from the gate keeper to the VoIP gateway and the media gateway. The VoIP gateway on the originating side transmits to the media gateway on the destination side an admissions confirm (ACF) after attaching the authentication key. Then, the media gateway collates the authentication key obtained from the originator VoIP gateway with the authentication key obtained from the gate keeper and continues the call setup procedure only when the two authentication keys coincide with each other. On the other hand, in case of non-coincidence, the gate keeper carries out a call release. Through this, an illegal connection call not routing through the gate keeper is excluded without fail.
    Type: Application
    Filed: May 3, 2002
    Publication date: July 3, 2003
    Inventors: Makoto Hirayama, Kazuhiro Kita, Tomohide Sugimoto