A system for detecting fraud in international telecommunication traffic, comprising: - a transactions registry accessible by multiple operators and/or carriers; - a logging module installed with each of said multiple operators and/or carriers configured to add an entry in said transactions registry by an operator and/or carrier handling a call, wherein said entry comprises the calling number, the called number and timing information for said call; - a fraud detection and classification module configured to: ∘ select from said transactions registry a group of correlated entries representing said call, by selecting entries added by different operators and/or carriers that all relate to said call, said selection being based on said timing information and/or said calling number and/or said called number; ∘ compare said correlated entries, by at least comparing the calling numbers comprised in respective correlated entries, • to detect in said correlated entries an anomaly due to said fraud, thereby detecting a fraudulent call; and • to, based on said detected anomaly in said correlated entries, classify said fraudulent call into a fraud type using a decision logic; - a notification and reporting module, configured to transmit and/or store and/or process one or more results of said fraud detection and classification module, wherein the output generated by said notification and reporting module at least comprises notifications transmitted to an operator or carrier handling said call, for notifying said operator or carrier about said fraud upon detection of said fraudulent call routed via a fraudulent party, thereby allowing said operator or carrier to adapt its routing to avoid that future calls are handled via fraudulent routes involving fraudulent parties. - a transactions registry accessible by multiple operators and/or carriers; - a logging module installed with each of said multiple operators and/or carriers configured to add an entry in said transactions registry by an operator and/or carrier handling a call, wherein said entry comprises the calling number, the called number and timing information for said call; - a fraud detection and classification module configured to: ∘ select from said transactions registry a group of correlated entries representing said call, by selecting entries added by different operators and/or carriers that all relate to said call, said selection being based on said timing information and/or said calling number and/or said called number; ∘ compare said correlated entries, by at least comparing the calling numbers comprised in respective correlated entries, • to detect in said correlated entries an anomaly due to said fraud, thereby detecting a fraudulent call; and • to, based on said detected anomaly in said correlated entries, classify said fraudulent call into a fraud type using a decision logic; ∘ select from said transactions registry a group of correlated entries representing said call, by selecting entries added by different operators and/or carriers that all relate to said call, said selection being based on said timing information and/or said calling number and/or said called number; ∘ compare said correlated entries, by at least comparing the calling numbers comprised in respective correlated entries, • to detect in said correlated entries an anomaly due to said fraud, thereby detecting a fraudulent call; and • to, based on said detected anomaly in said correlated entries, classify said fraudulent call into a fraud type using a decision logic; • to detect in said correlated entries an anomaly due to said fraud, thereby detecting a fraudulent call; and • to, based on said detected anomaly in said correlated entries, classify said fraudulent call into a fraud type using a decision logic; - a notification and reporting module, configured to transmit and/or store and/or process one or more results of said fraud detection and classification module, wherein the output generated by said notification and reporting module at least comprises notifications transmitted to an operator or carrier handling said call, for notifying said operator or carrier about said fraud upon detection of said fraudulent call routed via a fraudulent party, thereby allowing said operator or carrier to adapt its routing to avoid that future calls are handled via fraudulent routes involving fraudulent parties.