A mobile communication system, comprising: a mobile station; a core network; a base station for wirelessly communicating with the mobile station; and a gateway apparatus connected to the base station and the core network, wherein the mobile station comprises: transmission means for transmitting a RRC, Radio Resource Control, Initial Direct Transfer message including an Establishment Cause set to Emergency Call to the base station, the base station comprises: first transmission means for transmitting to the gateway apparatus a registration message which includes a Registration Cause set to Emergency Call for registering the mobile station in the gateway apparatus if the base station receives the RRC Initial Direct Transfer message from the mobile station; and second transmission means for transmitting a RUA, RANAP, Radio Access Network Application Part, User Adaption, Direct Transfer message which includes information about call type, the gateway apparatus comprises: first reception means for receiving the registration message which includes Registration Cause set to Emergency Call from the base station; second reception means for receiving the RUA Direct Transfer message from the base station; check means for checking whether or not both of the registration message and the RUA Direct Transfer message indicate an emergency call, and means forperforming a call releasing process if the check means determines that the Registration Cause is set to Emergency Call and the RUA Direct Transfer message indicates a Normal call. a mobile station; a core network; a base station for wirelessly communicating with the mobile station; and a gateway apparatus connected to the base station and the core network, wherein the mobile station comprises: transmission means for transmitting a RRC, Radio Resource Control, Initial Direct Transfer message including an Establishment Cause set to Emergency Call to the base station, transmission means for transmitting a RRC, Radio Resource Control, Initial Direct Transfer message including an Establishment Cause set to Emergency Call to the base station, the base station comprises: first transmission means for transmitting to the gateway apparatus a registration message which includes a Registration Cause set to Emergency Call for registering the mobile station in the gateway apparatus if the base station receives the RRC Initial Direct Transfer message from the mobile station; and second transmission means for transmitting a RUA, RANAP, Radio Access Network Application Part, User Adaption, Direct Transfer message which includes information about call type, first transmission means for transmitting to the gateway apparatus a registration message which includes a Registration Cause set to Emergency Call for registering the mobile station in the gateway apparatus if the base station receives the RRC Initial Direct Transfer message from the mobile station; and second transmission means for transmitting a RUA, RANAP, Radio Access Network Application Part, User Adaption, Direct Transfer message which includes information about call type, the gateway apparatus comprises: first reception means for receiving the registration message which includes Registration Cause set to Emergency Call from the base station; second reception means for receiving the RUA Direct Transfer message from the base station; check means for checking whether or not both of the registration message and the RUA Direct Transfer message indicate an emergency call, and means forperforming a call releasing process if the check means determines that the Registration Cause is set to Emergency Call and the RUA Direct Transfer message indicates a Normal call. first reception means for receiving the registration message which includes Registration Cause set to Emergency Call from the base station; second reception means for receiving the RUA Direct Transfer message from the base station; check means for checking whether or not both of the registration message and the RUA Direct Transfer message indicate an emergency call, and means forperforming a call releasing process if the check means determines that the Registration Cause is set to Emergency Call and the RUA Direct Transfer message indicates a Normal call.