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Session Initiation Protocol has been widely deployed to enable multimedia communication. To guarantee service reliability and scalability, service providers usually deploy SIP server farms. In this paper, the authors present a reliable and scalable DHT-based SIP server farm. In the proposed server farm, one-hop DHT is adopted and a new SIP event package called SIEP (Server Information Event Package) is designed. In addition, a novel load sharing and failover scheme is designed based on one-hop DHT and SIEP. Compared with multi-hop DHT, one-hop DHT produces less overhead in DHT-based SIP server farm.
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