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In this paper, it is the resource management method for guaranteeing QoS in providing the IMS (IP multimedia subsystem)-based VoIP service in BcN. But, a user desires in the BcN environment in which wire and wireless network are integrated to receive the service in which the quality is guarantee. And the concern about QoS grows. In this paper, the method of providing the VoIP service with the high quality reserves the resource of the transport layer by using the network control platform and service control platform. After a network being comprised through the OPNET simulation and simulating, a performance was analyzed.