[VoiceOps] Fraud Management

Hi Guys, Trying to get a feel for what fraud systems are out there for VoIP service providers; primarily using terrestrial mediums (such as metroE; diginet) with clients interconnecting via IP PBXs, voice gateways and IP phones. We have had fraud to international premium destinations which we are restricting based on calling profiles and originating source IPs; but neither is truly scalable. Subsequently we are looking for alternatives. Regards, Shaun