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—Due to the growing demand for VoIP (Voice over Internet Protocol) services, researches on VoIP design have attained more and more attention. Compared with a traditional voice service-PSTN (Public Switched Telephony Network), VoIP is able to provide lower cost and more flexibility. However, there are still many challenging issues to guarantee a consistent(More)
Most Internet-based collaborative computing systems face the major problem: freeriding. The abundance of freeriders, and load imbalance it creates, punishes those peers who do actively contribute to the network by forcing them to overuse their resources. Hence, the overall system performance becomes to degrade quickly. The goal of this paper is aimed to(More)
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