GATEWAY DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

摘要

A gateway apparatus 110 includes: a communication unit 111 communicating a frame signal conforming to an IuUP (Iu User Plane) protocol with a wireless base station controller connected to a circuit switching network 101; a determination unit 112 for determining whether the frame signal received by the communication unit indicates a time alignment request for a sound signal to a circuit switching network or not; a conversion unit 113, converting information mcluded in the frame signal to information to be set in a call control signal of an IMS (IP Multimedia Subsystem) when the frame signal indicates a time alignment request; and a call control signal transmission unit 114 transmitting the call control signal including the converted information to a communication apparatus in the IMS 102.