Abstract: A communication system comprises a communications network coupled at least to a terminal unit. The communications network is coupled to a service device which comprises a switching center, a controller, and a data bank. The data bank contains at least a service logical program. A terminal unit generates a first parameter and a second parameter for sending as a single transmission to the service device. The controller extracts a service logical program from the data bank in response to the first parameter. The controller further controls the switching center in response to the second parameter based on the extracted service logical program.

Abstract: A communication system comprising a controller (1) arranged for service implementation. The controller (1) is arranged for extracting a service logical program from a data bank (3) after the controller has received parameters transmitted by a terminal unit (6), and for activating a service in response to a service logical program and second parameters and, in response to a service logical program and first parameters, for providing a service for a subscriber and for transmitting at least one service parameter to the terminal unit (6, 8) and/or, in response to a service logical program and fourth parameters, for deleting a subscriber's authorization to use a service.