Patent ID: 8583125

Claim:
A radio routing agent comprising: a management unit that manages an entire radio resource of an available system, and a route state; and a route selection unit that provides an optimum wireless route of a plurality of wireless routes based on an entire radio resource and a route state by interlocking with the management unit when a call is attempted from a terminal that can access a different plurality of networks, transmit and receive data, wherein an optimum wireless route query is received from a call processing apparatus that is connected to the terminal, the route selection unit selects an optimum wireless and transmits the optimum wireless route to the call processing apparatus, and wherein when the call processing apparatus fails in a call processing in the optimum wireless route, if the optimum wireless route query is received again, the route selection unit reselects an optimum wireless route of a plurality of wireless routes based on an entire radio resource and a route state by interlocking with the management unit.