| 摘要 |
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.
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