A sub-network device and a method of communicating using a sub-network, interconnect device and a network as a backbone within a communications system includes receiving a request for information at the interconnect device from a wireless communications device to communicate with the interconnect device, the interconnect device interconnects the wireless communications device to the sub-network, transmitting the request for information from the wireless communications device to the network, the network including terrestrial communications and being connected to a public safety agency network, receiving the requested information at the sub-network from the public safety agency network over the network in response to the transmitted request for information and transmitting the requested information back to the wireless communications device through the interconnect device.