Dataanslutning i telefonsystem

摘要

The inventive idea is to define a closed user group including the access point of a data network and users of a service. Such incoming calls are barred, which come from outside the user group to the access point of the data service. Calls within the user group coming to the access point are allowed. Hereby the telephone system itself prevents users outside the user group of the data service from gaining access to the network.