Patent ID: 8010125

Claim:
A call system comprising: a call control device to perform call control between terminals on the basis of location information of the terminals; a relay node to relay communications of the terminals; and a location management device to manage the location information of the terminals, the relay node including: a request detecting unit to detect a location registration request given to the call control device from a terminal; a notifying unit to notify the call control device of the detected location registration request and to notify the location management device of a registration information of the terminal, the registration information including an address of the call control device which is an original destination of the detected location registration request; and a connection detecting unit to detect a connecting status with the terminal, wherein the notifying unit notifies, if the connecting status with the terminal is changed, the call control device of an update of the location information, and the location management device including: an update notifying unit to send a location registration request to a predetermined address, and a location management unit to judge based on the connecting status of the terminal whether a connecting location of the terminal moves or not, wherein when the terminal moves, the update notifying unit notifies the call control device of an update of the location information, and the notifying unit of the relay node notifies the location management device of the connecting status with the terminal, and the update notifying unit of the location management device is thereby made to notify the call control device of the update of the location information.