| 摘要 |
<p>PROBLEM TO BE SOLVED: To establish a VPN tunnel in response to access from a management terminal to a communication terminal at a site.SOLUTION: A management terminal belonging to a first network periodically receives a registration request for information on a communication terminal belonging to a second network, from a gateway device belonging to the second network. A control device belonging to the first network receives a communication request for ensuring a communication path between the management terminal and communication terminal, from the management terminal. The control device transmits a newest response to the registration request which has been periodically received from the gateway device including the communication request for ensuring the communication path between the management terminal and communication terminal, to the gateway device. The gateway device permits access from the management terminal to the communication terminal through a tunnel established in response to the communication request.</p> |
