With the growing popularization of mobile communication services, a growing demand for better Quality of Service (QoS) arises from the subscribers. An uninterrupted service provided with the network after a node failure is also expected from operators. To achieve these, duplex backup and even multiple backup functions have been gradually introduced into the network. Among redundancy technologies, dual home and IuFlex are more successful. Dual home is a typical duplex backup system with activation of the standby server after the host server failure. IuFlex is one of the multiple backup technologies with overhead transference to other node in switching pool after single switching node failure. With the growing popularization of mobile communication services, a growing demand for better Quality of Service (QoS) arises from the subscribers. An uninterrupted service provided with the network after a node failure is also expected from operators. To achieve these, duplex backup and even Among the multiple backup functions have been been gradually introduced into the network. Among redundancy technologies, dual home and IuFlex are more successful. Dual home is a typical duplex backup system with activation of the standby server after the host server failure. IuFlex is one of the multiple backups technologies with overhead transference to other node in switching pool after single switching node failure.