| 摘要 |
A gateway, program and method for use in a packet-based communication system. The gateway 119 comprises: a connection to a public packet-based network 101, 108 comprising a public-network server 104 and a plurality of public-network user terminals 102; a connection to a private packet-based network 111 comprising a private-network server 114 and a plurality of private-network user terminals 112 each installed with a public-network communication client; a processing device arranged to receive a login request from a public-network client of a private-network user terminal 112, and in response to initiate both a private-network authentication procedure involving the private-network server 114 and a public-network authentication procedure involving the public-network server 104, so as subject to both authentication procedures to enable establishment of a communication channel between one of the public-network user terminals and the public-network client of the private-network user terminal; wherein the processing device is further configured to apply a control policy to communications occurring over said channel. The packet-based communications system may be a Voice-over Internet Protocol or Video-over Internet Protocol (VoIP) system embodied on a Peer-to-peer network, wherein the private network may be integrated with the per-to-peer communication system implemented over the public network. Both authentication procedures may be used in the establishment of a voice or video call between one of the public-network user terminals and one of the private network user terminals.
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