During an incoming call, when a client apparatus of an incoming side notifies a client apparatus of an outgoing side of hold of the incoming call, the client apparatus notifies the client apparatus of the hold of the incoming call with OK message which is a response to an INVITE message. The frequency of the location determination function may be adjusted based on whether the mobile communication device is moving and may be further adjusted based on battery voltage or expected battery life. A second device is also mounted within the integrated circuit package. In this content-based routing architecture, a virtual overlay network called the virtual content network is superimposed over the physical network.