Provided are a communication control device by which a situation where a mobile station is disabled to receive a terminating call can be prevented from continuing for a long time, even when the IP-CAN bearer is removed for some reason. A P-CSCF 310 executes the steps of: detecting a state of the IP-CAN Bearer; transmitting a 503 Service Unavailable, rejecting a terminating call to an UE 100, to a source making the terminating call when loss of the IP-CAN Bearer which has been established is detected; and canceling the transmission of the rejection response when receiving a signal from the UE 100 in a situation where the loss of the IP-CAN bearer is detected, the signal being related to an originating call to the IP multimedia subsystem and being a signal other than registration to the IP multimedia subsystem.