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VoIP market is growing fast and will replace a considerable portion of existing PSTN or 2G/3G which is under big trouble with spam calls. In VoIP, spam calls can be occurred more frequently because of its low cost and easy modification. In this paper, we propose user reputation based spam defense architecture which consists of four spam defense techniques. Each spam defense techniques can be adapted to VoIP service provider step by step. Next time, we will implement and evaluate the proposed schemes through VoIP trap system which collects spam information from VoIP commercial environments.