A technique in a telecommunications core network of processing a call between at least a first subscriber terminal and a second subscriber terminal. Verifying that the call is eligible for call analysis by checking the settings of call monitoring consent. Then, a first node on a call control plane of the core network is triggered to provide subscriber data to a call analysis node. The subscriber data includes at least one subscriber identifier. A second node on a user plane of the core network is triggered to direct at least a part of media data included in the call to the call analysis node. Related operations for legal interception and monitoring of a call and for separation of user plane and call control plane are provided.
