In the course of its logging on at a base station (B2) coupled to a switching device (V), a mobile terminal device (E1) transmits a terminal equipment identifier (EK1) identifying the mobile terminal device (E1) to the base station (B2). The base station (B2) thereupon transmits the terminal equipment identifier (EK1)-if appropriate together with a base station identifier (BK2) identifying the base station (B2)-to the switching device (V) and initiates the activation of a forwarding performance feature, e.g. for call diversion, known per se in connection with wire-based terminal equipment, in the switching device (V). As a result of the activation of this forwarding performance feature, a connection setup to be routed via the base station (B2) is initiated in the event of connection requests directed to the mobile terminal device (E1). As a result, a central radio switching assembly, as required in known handover methods, is unnecessary.