Abstract: A list of routing objects is associated with each switching node of a telecommunication network. This list includes a plurality of routing objects whose parameters are described in tree-structure form. Responsive to a call message received by said node, routing objects of the list whose parameters have tree-structure descriptions included in tree-structure descriptions of signalling elements of the call message are searched. Among all these routing objects, an object having a maximum gain is selected so as to route a communication associated to said call message according to a downstream path parameter of the object selected. Gains for each object are computed as a function of charge recorder information. New objects are created by incrementing by one level the tree-structure of each parameter of said maximum gain object. Each object whose difference in gain per communication with the maximum gain object is high is maintained.