The method of synchronizing call supplementary service configuration comprises the steps of acquiring the configuration parameters received additional service configuration command input, corresponding to the additional service configuration instructions, using a circuit switched domain, upload the configuration parameters to the mobile switching center to a step, it is whereby the mobile switching center, the configuration parameters as the call supplementary service configuration of the circuit switched domain, the method comprising: receiving storing in the home location register, the steps, the configuration feedback information returned, configured feedback according to the information, it determines whether the order is successful, if the configuration is successful, comprising the steps of: storing the configuration parameters to the call supplementary service configuration on the terminal. In addition, a synchronizer and a system for call supplementary service configuration, a method of synchronizing compatible call supplementary service configuration to the system is provided. The method of synchronization for the call supplementary service configuration, the apparatus and system, calls supplementary services configuration on the terminal can be adapted to a plurality of communication networks.