Abstract: The present invention relates to the ability to set up connections on demand between subscribers and service providers and allows network capacity to be best shared among users. Whenever a service terminal (ST) requests a service (S) from a service provider (SP), an authentication server (AUTH) checks whether the service terminal can access the requested service. If so, a network controller (CTRL) set up a connection (C) to deliver the requested service with the required quality of service, said connection being established between the network termination (NT), to which the service terminal is coupled, and the access server (AS), to which the service provider is coupled. The authentication server supplies transport requirements of the requested service for establishing the connection.