Patents by Inventor Shun-Chao Huang

Shun-Chao Huang 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).

  • Mobile VPN proxy method based on session initiation protocol
    Publication number: 20060230445
    Abstract: A mobile VPN proxy method is based on an SIP communication protocol, whereby a mobile node (MN) roaming in a foreign network has secure communication with a communication node (CN) in a home network. A first SIP proxy server, an application level gateway (ALG), a second SIP proxy server and an AAA server are provided between the home network and the foreign network. The second SIP proxy server modifies a message transmission direction of an SIP/SDP message packet of the CN and sends the packet to the ALG, when the second SIP proxy server detects the MN intending to connect to the home network. The first SIP proxy server performs identification/authentication for the MN and generates a negotiation key to the ALG to establish a secure connection between the first SIP proxy server and the ALG. Moreover, the ALG takes over the communication between the MN and the CN.
    Type: Application
    Filed: April 6, 2005
    Publication date: October 12, 2006
    Inventor: Shun-Chao Huang