| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for turning an SIP (session initiation protocol)communication protocol structure into a mobile VPN (virtual private network) agent. <P>SOLUTION: At least one mobile node is made to roam in an external network and safely perform data transmission with a communication node in an internal network, and a first SIP proxy server, an application level gateway (ALG) and a second SIP proxy server and an AAA server are constructed between the internal network and the external network. The second SIP proxy server modifies a data transmission direction of a communication node information packet and transmits the communication node information packet to the ALG, when the mobile node is connected to the internal network. Also, the first SIP proxy server authenticates and authorizes the mobile node through the AAA server, generates a negotiation key, transmits the negotiation key to the ALG and finally inherits transmission between the mobile node and the communication node by the ALG, to reduce the transmission delay from a terminal to a terminal and the frequency width the consumption of a packet header. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
