A method and apparatus for connecting a subscriber apparatus or subscriber's network to a mobile network, wherein a network element is placed between a mobile network and a subscriber apparatus or subscriber's network. The network element emulates the appropriate interface towards both the mobile network and a subscriber apparatus or subscriber's network that are attached to the network element. The network element is assigned the task to switch and, if necessary, concentrate calls between the mobile network and subscriber's network. In addition, the network element advantageously comprises a database block that stores the subscriber data needed by the mobile network, which data correspond to subscriber apparatus in the subscriber's network connected to the mobile network.