| 摘要 |
A communications system which switches from an active server to a backup server without delay or interruption, thus achieving better quality of Voice over IP (VoIP) service. The system employs a first server to centrally manage client address information and a second server to back up the first server. They serve a plurality of clients, each having a client address registration unit and a communication controller. The client address registration unit registers the client with both the first and second servers by sending client address information thereto. The communication controller receives a resolved destination IP address and an allocated network bandwidth from the first server in normal situations, and from the second server when the first server is unresponsive.
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