A mobile communication system of the present invention includes: a mobile station; a base station wirelessly communicating with the mobile station; and a gateway apparatus connected to the base station and a core network. The base station includes: first transmission means for transmitting a registration message for registering the mobile station in the gateway apparatus; and second transmission means for transmitting a message pertaining to establishment of an emergency call originated by the mobile station. The gateway apparatus includes: first reception means for receiving the registration message from the base station; second reception means for receiving an establishment message pertaining to establishment of the emergency call from the base station; and check means for checking consistency between the registration message and the establishment message.