Patent ID: 8218431

Claim:
A gateway device for establishing connection between a telephone network including a re-direction function and an Internet protocol multimedia subsystem (IMS) network, and transmitting a call-out signal from a device located in the telephone network to a device located in the IMS network, the gateway device comprising: a re-direction notification receiving part to receive from another gateway device a re-direction notification including call identification information included in the call-out signal received by the another gateway device; a storage part to store the call identification information included in the re-direction notification; a re-direction notification response generating part to generate a response to the re-direction notification; a re-direction notification response transmitting part to transmit the response to the another gateway device; a receiving part-to receive a re-call-out signal transmitted from the telephone network in response to a re-direction request issued by the another gateway device, the re-call-out signal including move-source-device identification information to which receiving-device identification information included in the call-out signal is set, and the receiving-device identification information to which identification information identifying the gateway device is set; a call processing part to generate, when call identification information identifying the re-call-out signal matches a call identification information item stored in the storage part, a call-out signal including the receiving-device identification information to which the move-source-device identification information included in the re-call-out signal is set, and a transmitting part to transmit the call-out signal generated by the call processing part to a receiving device associated with the receiving-device identification information included in the call-out signal.