A method for the improved exploitation of resources between telecommunications networks and IP networks (for example, corporate LANs or the public Internet) for reducing the costs of permanent connections (always-on connections) and for optimizing IP address economy. During the periods when there is no traffic, the connection between the telecommunications network and the IP network is deactivated, while the subscriber-side connection is maintained. When the subscriber has new data traffic, the RC automatically activates the IP connection concerned to the ISP with reversion to the stored authentication data.