A method permitting the control of the service quality and/or service fees of telecommunication services in which several service nodes are involved. During the initiation and/or implementation of a communication service, an exchange of signaling data occurs between a communications terminal and at least two service nodes which are involved in the communication service. The control node detects whether the service data transmitted by the at least two service nodes relate to the very same communication service. Then the control node selects service data from the transmitted service data and uses these service data for controlling the service quality and/or service fees.