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As with email, SIP-based services such as voice over IP or instant messaging can distribute information to numerous recipients at low cost. With SIP's increased popularity, it's reasonable to expect that, also similar to email, the level of spam over Internet telephony (SPIT) will increase in the coming years. To enable VoIP service providers to detect and react to SPIT calls, the authors present a SPIT Detection and Reaction System that incorporates multiple detection methods. To enable a higher flexibility and customization level, the system takes into account operators' and users' policies for identifying and reacting to SPIT calls.