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The authors have developed a new on-demand VPN system that works over a managed SIP network such as the Next-Generation Network (NGN). The system achieves a stable broadband VPN connection between two home networks in an easy-to-use manner by using SIP for session management. The system uses telephone numbers, QoS management, and packet-filtering capabilities that are provided by the NGN. In this paper, they describe the system and focus on how IKEv2 and IPsec, with a slight extension to the port-number handling, can be adapted to an NGN that has NATor 5-tuple-based packet filtering within the network.
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