Patent ID: 8121592
Filing Date: 2012-02-21
Classification: H04W

Abstract:
1. A mobile communication system, comprising: a private IP network and a public network; a gateway device connecting the private IP network and the public network; an IP wireless base station connected to the private IP network and providing a first communication area; an IP-PBX serving for communication exchange for the IP wireless base station and connected to the private IP network; an IP terminal connected to the IP-PBX; a public wireless base station connected to the public network and providing a second communication area; a public wireless exchange serving for communication exchange for the public wireless base station and connected to the public network; a mobile terminal to which a first phone number for the private IP network and a second phone number for the public network are allocated, the mobile terminal comprising: the control unit notifying the IP-PBX of the movement of the mobile terminal at a time of detection of the movement, the IP-PBX instructing the gateway device to call the second phone number when the movement is notified of, the gateway device making a call through the public wireless exchange to the second phone number of the mobile terminal, the control unit comparing a phone number of the gateway device making the call with the continuous connection number held by the memory, the control unit automatically making a response to the call when the phone number of the gateway and the continuous connection number agree with each other and transmitting the response to the public wireless exchange while continuing communication with the IP terminal through the IP wireless base station, the public wireless exchange transferring the response to the gateway device, the gateway device notifying the IP-PBX of the response from the mobile terminal to connect with the mobile terminal, whereby the mobile terminal is tentatively connected to the gateway, and the IP-PBX switching a communication path between the mobile terminal and the IP terminal from a communication path through the IP wireless base station to a communication path through the public wireless base station when the IP-PBX receives the response from the mobile terminal through the gateway device.