A call control device (800, 1100), wherein the call control device is a home subscriber server that is located on a home network of called user equipment UE, wherein the home network includes an IP multimedia subsystem domain and a circuit-switched domain, and the call control device comprises: a receiving module, configured to: when a call is being initiated to the called UE, receive an access domain confirmation request message sent by a call routing device that is a gateway mobile switching center GMSC on the home network, wherein the access domain confirmation request message carries an identifier of the called UE; a determining module, configured to determine, according to the identifier of the called UE received by the receiving module, that the home network communicates with a visited network of the called UE by using the circuit switched CS domain on the home network; and a sending module, configured to: after the determining module determines that the home network communicates with the visited network by using the CS domain on the home network, send an access domain confirmation response message to the call routing device, wherein the access domain confirmation response message carries instruction information, and the instruction information is used to instruct the call routing device to route the call to the visited network by using the CS domain on the home network, characterized in that the receiving module is further configured to receive a location update request message sent by a visited mobile switching center VMSC on the visited network, wherein the location update request message carries the identifier of the called UE; and the sending module is further configured to: if the home network communicates with the visited network by using the CS domain on the home network, send a data insertion request message to the VMSC according to the identifier of the called UE received by the receiving module, wherein the data insertion request message carries subscriber information stored when the called UE subscribes to a service on the home network, so as to instruct the VMSC to perform registration of the called UE with the visited network according to the subscriber information. a receiving module, configured to: when a call is being initiated to the called UE, receive an access domain confirmation request message sent by a call routing device that is a gateway mobile switching center GMSC on the home network, wherein the access domain confirmation request message carries an identifier of the called UE; a determining module, configured to determine, according to the identifier of the called UE received by the receiving module, that the home network communicates with a visited network of the called UE by using the circuit switched CS domain on the home network; and a sending module, configured to: after the determining module determines that the home network communicates with the visited network by using the CS domain on the home network, send an access domain confirmation response message to the call routing device, wherein the access domain confirmation response message carries instruction information, and the instruction information is used to instruct the call routing device to route the call to the visited network by using the CS domain on the home network, characterized in that the receiving module is further configured to receive a location update request message sent by a visited mobile switching center VMSC on the visited network, wherein the location update request message carries the identifier of the called UE; and the sending module is further configured to: if the home network communicates with the visited network by using the CS domain on the home network, send a data insertion request message to the VMSC according to the identifier of the called UE received by the receiving module, wherein the data insertion request message carries subscriber information stored when the called UE subscribes to a service on the home network, so as to instruct the VMSC to perform registration of the called UE with the visited network according to the subscriber information.