Transmission management system, transmission system, program, program supply system, and maintenance system

1. A transmission management system that manages image communications among a plurality of transmission terminals capable of performing at least voice communications, the transmission management system comprising:

a terminal management section that manages image communications state information indicating an image communications state of each of the transmission terminals for each terminal identification information for identifying each transmission terminal;

a creation section that creates a specified communications control message causing the specified transmission terminal to control the image communications in accordance with the image communications state information; and

a transmitting section that transmits the created communications control message to the transmission terminal caused to control the image communications among the transmission terminals.

2. The transmission management system according to claim 1 , wherein in a first case in which the image communications state information indicates that a single transmission terminal is performing image communications and one or more other transmission terminals are halting image communications among the transmission terminals,

the creation section creates a first communications control message indicating that the one or more other transmission terminals are halting image communications and a second communications control message indicating that the single transmission terminal is performing image communications, and

the transmitting section transmits the first communications control message to the single transmission terminal that is performing image communications and the second communications control message to the one or more other transmission terminals that are halting image communications.

3. The transmission management system according to claim 1 , wherein in a second case in which the image communications state information indicates that more than one of the transmission terminals are performing image communications and one or more other transmission terminals are halting image communications among the transmission terminals,

the creation section creates a third communications control message indicating that the more than one of the transmission terminals are performing image communications, and

the transmitting section transmits the third communications control message to the one or more other transmission terminals that are halting image communications.

4. The transmission management system according to claim 1 , wherein in a third case in which the image communications state information indicates that a single transmission terminal is performing image communications and one or more other transmission terminals have no image communications function among the transmission terminals,

the creation section creates a fourth communications control message indicating that the image communications is to be forcibly stopped, and

the transmitting section transmits the fourth communications control message to the single transmission terminal that is performing image communications.

5. The transmission management system according to claim 1 , wherein in a fourth case in which the image communications state information does not correspond to any of a first case in which the image communications state information indicates that a single transmission terminal is performing image communications and one or more other transmission terminals are halting image communications among the transmission terminals, a second case in which the image communications state information indicates that more than one of the transmission terminals are performing image communications and one or more other transmission terminals are halting image communications among the transmission terminals, and a third case in which the image communications state information indicates that a single transmission terminal is performing image communications and one or more other transmission terminals have no image communications function among the transmission terminals,

the creation section creates a display control message indicating that specified display messages displayed on the transmission terminals are to be deleted, and

the transmitting section transmits the display control message to the transmission terminals.

6. A transmission system, comprising:

the transmission management system according to claim 2 ; and

the transmission terminals whose image communications are managed by the transmission management system, wherein

each of the transmission terminals includes:

a receiving section that receives a communications control message transmitted from the transmission management system; and

a display control section that causes a specified display section to display a display message based on the received communications control message.

7. A transmission system, comprising:

the transmission management system according to claim 4 ; and

the transmission terminals whose image communications are managed by the transmission management system, wherein

each of the transmission terminals includes:

a receiving section that receives a communications control message transmitted from the transmission management system; and

a communications stop section that causes the transmission terminal to stop performing image communications in accordance with the received communications control message.

8. The transmission system according to claim 7 , wherein

each of the transmission terminals further includes

a control section that causes an image capturing section imaging a subject and obtaining image data to be subjected to the image communications to stop the imaging in accordance with the communications control message received by the receiving section.

9. A transmission system, comprising:

the transmission management system according to claim 5 ; and

the transmission terminals whose image communications are managed by the transmission management system, wherein

each of the transmission terminals includes:

a receiving section that receives a display control message transmitted from the transmission management system; and

a display control section that causes a specified display section to delete the specified display message displayed on the specified display section in accordance with the received display control message.

10. A non-transitory computer-readable recording medium with an executable program stored thereon and executed by a computer of a transmission management system that manages image communications among a plurality of transmission terminals capable of performing at least voice communications, wherein the program instructs a computer to perform:

managing image communications state information indicating an image communications state of each of the transmission terminals for each terminal identification information for identifying each transmission terminal;

creating a specified communications control message causing the specified transmission terminal to control the image communications in accordance with the image communications state information; and

transmitting the created communications control message to the transmission terminal caused to control the image communications among the transmission terminals.

11. A program supply system that supplies the program stored on the computer-readable recording medium according to claim 10 to the transmission management system through a communications network.

12. A maintenance system that performs maintenance of the transmission management system according to claim 1 .