A method to reduce the consumption of resources for the legal interception or retention of data related to traffic related to a 2G / 3G target mobile connected to a telecommunications network that interacts with the Evolved Package System, comprises the steps of: - in a First node, detect (200, 300) at least one parameter value in the data for which Legal Interception or data retention based on said at least parameter value has been activated, evaluating (211, 310) if said traffic it is intercepted or held on a second node crossed by said traffic on the same network; - filter (212, 320) the legal interception requests or the intercepted data if said second node is located downstream of said first node.
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