Patent ID: 7221940
Filing Date: 2007-05-22
Classification: H04W

Abstract:
1. A call control server which is disposed on a wireless network using a wireless system without a paging function and establishes a session with a mobile terminal, in response to a call request from a communication initiating terminal to communicate with the mobile terminal that performs communications using the wireless network and a cellular network, said call control server comprising: an address resolving section that inquires about position information of the mobile terminal at a position information managing server that manages the position information of the mobile terminal, in response to a call request transmitted from the communication initiating terminal to initiate a session with the mobile terminal; a subscriber number receiver that receives a cellular subscriber number of the mobile terminal when the call control server receives registration failure information indicating that the mobile terminal has failed to establish a wireless link with the wireless network transmitted from the mobile terminal; and a cellular caller that requests to initiate a session to the cellular network based on the cellular subscriber number.