Call system

Abstract

Provided is a technology by which a relay node relaying communications of a terminal detects a movement of the terminal and updates, as triggered by this movement of the terminal, information of a call processing device, thereby shortening a (period of) status in which a location of the terminal remains not to be coincident with location information registered in the call processing device. A system of the invention has a call control device performing call control between terminals on the basis of location information of the terminals, a location management device managing information about locations of the terminals and a relay node relaying communications of the terminals, wherein the relay node detects a connecting status with the terminal, and, when the connecting status with the terminal is changed, notifies the call control device of an update of the location information through the location management device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a whole IP telephony system according to the invention.

FIG. 2 is a function block diagram of an access point.

FIG. 3 is a function block diagram of a location management server.

FIG. 4 is a function block diagram of an SIP server.

FIG. 5 is a flowchart showing a process related to a notification of a connecting status.

FIG. 6 is an explanatory diagram of notifying of the connecting status of the terminal.

FIG. 7 is a flowchart showing a process related to a notification of location information.

FIG. 8 is an explanatory diagram related to the notification of the location information.

FIG. 9 is an explanatory diagram of an incoming call in a case where the terminal exists in a wireless area of an access point of a home.

FIG. 10 is a flowchart showing a sequence when canceling the connection of the terminal.

FIG. 11 is an explanatory diagram when canceling a connecting relation.

FIG. 12 is a flowchart showing a sequence when canceling the connecting relation.

FIG. 13 is an explanatory diagram when canceling the connecting relation.

FIG. 14 is an explanatory diagram in a case where the terminal moves outside the wireless area of the access point of the home.

FIG. 15 is an explanatory diagram of updating Register information.

FIG. 16 is an explanatory diagram of updating the Register information.

FIG. 17 is an explanatory diagram of updating the Register information.

FIG. 18 is an explanatory diagram of updating the Register information.

FIG. 19 is an explanatory diagram in a case where the terminal moves outside the wireless area of an in-office access point.

FIG. 20 is an explanatory diagram of a background art.

Claims

1. A call system comprising a call control device performing call control between terminals on the basis of location information of the terminals, and a relay node relaying communications of the terminals, the relay node including: a connection detecting unit detecting a connecting status with the terminal; anda notifying unit notifying, if the connecting status with the terminal is changed, the call control device of an update of the location information.

2. A call system according to claim 1, further comprising a location management device managing the location information of the terminals, wherein the location management device includes:a receiving unit receiving the connecting status of the terminal from the relay node;a location management unit judging based on the connecting status of the terminal whether a connecting location of the terminal moves or not; anda update notifying unit notifying, when the terminal moves, the call control device of an update of the location information, andwherein 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.

3. A call system according to claim 2, wherein if the receiving unit of the location management device receives cancellation of the connection of the terminal, the update notifying unit notifies the call control device of invalidity of the location information registered by the terminal.

4. A call system according to claim 2, wherein the location management device manages registration information representing whether the location information of the terminal is registered in the call control device or not and information about the connecting status of the terminal in a way that associates these items of information with each other, and the update notifying unit, if the connection with the terminal making a location registration request is canceled, notifies of this cancellation.

5. A call system according to claim 2, wherein when the location management device receives, from the relay node, the notification purporting that the connection to the terminal is established, the update notifying unit notifies the call control device of the update of the location information.

6. A relay node relaying communications of a terminal subjected to call control by a call control device on the basis of location information of terminals, comprising: a connection detecting unit detecting a connecting status with the terminal; anda notifying unit notifying, if the connecting status with the terminal is changed, the call control device of an update of the location information.

7. A relay node according to claim 6, wherein the notifying unit notifies a location management device managing the location information of the terminals, of the connecting status with the terminal, and the location management device is thereby made to notify the call control device of the update of the location information.

8. A relay node according to claim 6, wherein if cancellation of the connection with the terminal is detected, the notifying unit notifies the call control device of invalidity of the location information registered by the terminal.

9. A relay node according to claim 6, further comprising request detecting unit detecting a location registration request given to the call control device from the terminal, wherein if the connection with the terminal making the location registration request is canceled, the notifying unit notifies of this cancellation.

10. A relay node according to claim 6, wherein when connecting to the terminal, the notifying unit notifies the call control device of an update of the location information.

11. A communication method executed by a relay node relaying communications of a terminal subjected to call control by a call control device on the basis of location information of the terminals, comprising steps of: detecting a connecting status with the terminal; andnotifying, if the connecting status with the terminal is changed, the call control device of an update of the location information.

12. A communication method according to claim 11, wherein on the occasion of notifying, a location management device managing the location information of the terminals is notified of the connecting status with the terminal, and the location management device is thereby made to notify the call control device of the update of the location information.

13. A communication method according to claim 11, wherein if cancellation of the connection with the terminal is detected, the call control device is notified of invalidity of the location information registered by the terminal by way of a notification of the update.

14. A communication method according to claim 11, wherein when detecting the location registration request given to the call control device from the terminal and when the connection with the terminal making the location registration request is canceled, a notification of the location information is given.

15. A communication method according to claim 11, wherein when connecting to the terminal, the call control device is notified of an update of the location information.

16. A recording medium recorded with a communication program executed by a relay node relaying communications of a terminal subjected to call control by a call control device on the basis of location information of the terminals, comprising steps of: detecting a connecting status with the terminal; andnotifying, if the connecting status with the terminal is changed, the call control device of an update of the location information.

17. A recording medium according to claim 16, wherein on the occasion of notifying, a location management device managing the location information of the terminals is notified of the connecting status with the terminal, and the location management device is thereby made to notify the call control device of the update of the location information.

18. A recording medium according to claim 16, wherein if cancellation of the connection with the terminal is detected, the call control device is notified of invalidity of the location information registered by the terminal by way of a notification of the update.

19. A recording medium according to claim 16, wherein when detecting the location registration request given to the call control device from the terminal and when the connection with the terminal making the location registration request is canceled, a notification of the location information is given.

20. A recording medium according to claim 16, wherein when connecting to the terminal, the call control device is notified of an update of the location information.