1. A method of supporting fraud detection in a telecommunication network, the method being executed in an electronic device implementing a mediating function in the network, and comprising: the electronic device monitoring a network security function and a fraud detection function, wherein the network security function analyzes traffic and terminal activities in the network in view of predefined alert criteria for detecting network and terminal attacks, and wherein the fraud detection function analyzes charging information on users in the network in view of predefined alert criteria for detecting fraud attacks; the electronic device receiving a first alert from a first one of the network security function and the fraud detection function, the alert indicating that predefined alert criteria of its associated function have been satisfied; and the electronic device modifying alert criteria of a second one of the network security function and fraud detection function based on the received first alert; wherein modifying the alert criteria comprises: setting a new detection rule for the second one of the functions; adding a new alert triggering condition for the second one of the functions; or adding a new parameter to be monitored with respect to a predefined threshold for the second one of the functions.