Voice communication system, voice communication method, and voice communication program

1. A voice communication system comprising a server device and a plurality of terminal devices, that are connected to each other via a network, wherein

a first terminal device of the plurality of terminal devices is configured to, as a caller, transmit, according to a transmission operation by a user, a voice signal and identification information of a second terminal device of the plurality of terminal devices, as a responder, to the server device,

the server device is configured to transfer the voice signal transmitted from the first terminal device to the second terminal device,

the server device is configured to continuously count a number of simultaneous receptions of the voice signals, and transfer, in a case where the number of simultaneous receptions reaches a predetermined restriction value, the received voice signal with transmission restriction information attached thereto, to the second terminal device, and

the second terminal device is configured to perform transmission restriction in which the second terminal device does not transmit a voice signal even when a transmission operation is performed by the user, during reception of a voice signal having the transmission restriction information attached thereto.

2. The voice communication system according to claim 1 , wherein the terminal device is configured to perform full duplex communication in which even when the terminal device is transmitting a voice signal to the server device, the terminal device receives a voice signal transmitted from the server device, in parallel.

3. The voice communication system according to claim 2 , wherein

the server device and the terminal device are each configured to divide the voice signal into predetermined time periods and perform sequential transmission thereof as voice packets,

the server device is configured to count the number of simultaneous receptions for each predetermined time period, and transmit, in a case where the number of simultaneous receptions reaches the predetermined restriction value, the voice packet with transmission restriction information attached thereto, and

the terminal device is configured to perform, in a case where the voice packet having the transmission restriction information attached thereto is received, transmission restriction for the predetermined time period.

4. The voice communication system according to claim 1 , wherein the terminal device is configured to continue transmission of a voice signal until termination of the transmission, even when a voice signal having the transmission restriction information attached thereto is received from another terminal device during transmission of the voice signal.

5. A voice communication method of performing mutual communication between a plurality of terminal devices including a first terminal device as a caller and a second terminal device as a responder, via a server device connected via a network, the method comprising:

transmitting by the first terminal device according to a transmission operation by a user, a voice signal and identification information of the second terminal device, as a communication partner, to the server device,

transferring by the server device the voice signal transmitted from the first terminal device to the second terminal device,

continuously counting by the server device a number of simultaneous receptions of the voice signals,

transferring by the server device, in a case where the number of simultaneous receptions reaches a predetermined restriction value, the received voice signal with transmission restriction information attached thereto, to the second terminal device, and

performing by the second terminal device transmission restriction in which the second terminal device does not transmit a voice signal even when a transmission operation is performed by the user, during reception of a voice signal having the transmission restriction information attached thereto.

6. The voice communication method according to claim 5 , wherein the terminal device is configured to perform full duplex communication in which even when the terminal device is transmitting a voice signal to the server device, the terminal device receives a voice signal transmitted from the server device, in parallel.

7. The voice communication method according to claim 6 , wherein

the server device and the terminal device are each configured to divide the voice signal into predetermined time periods and perform sequential transmission thereof as voice packets,

the server device is configured to count the number of simultaneous receptions for each predetermined time period, and transmit, in a case where the number of simultaneous receptions reaches the predetermined restriction value, the voice packet with transmission restriction information attached thereto, and

the terminal device is configured to perform, in a case where the voice packet having the transmission restriction information attached thereto is received, transmission restriction for the predetermined time period.

8. The voice communication method according to claim 5 , wherein the terminal device is configured to continue transmission of a voice signal until termination of the transmission, even when a voice signal having the transmission restriction information attached thereto is received from another terminal device during transmission of the voice signal.

9. The voice communication method according to claim 5 , wherein in a case where the number of simultaneous receptions in the server device has reached the predetermined restriction value, the first terminal device and the second terminal device are configured to perform alternate communication in which after transmission of a voice signal by the first terminal device is terminated, the second terminal device is configured to start transmission of a voice signal, and after transmission of the voice signal by the second terminal device is terminated, the first terminal device is configured to start transmission of a voice signal.

10. A non-transitory computer-readable recording medium storing a voice communication program, the program causing a controller of a server device that communicates with a plurality of terminal devices including a first terminal device as a caller and a second terminal device as a responder, via a network, to execute instructions comprising:

receiving a voice signal transmitted from the first terminal device;

continuously counting a number of simultaneous receptions of the voice signals; and

transferring a received voice signal to the second terminal device, the transferring including transferring, in a case where the number of simultaneous receptions reaches a predetermined restriction value, the received voice signal with transmission restriction information attached thereto, to the second terminal device.

11. The non-transitory computer-readable recording medium according to claim 10 , wherein

the receiving includes sequentially receiving voice packets including a voice signal divided into predetermined time periods, and

the continuously counting includes counting the number of simultaneous receptions for each predetermined time period.

12. The voice communication system according to claim 2 , wherein the terminal device is configured to continue transmission of a voice signal until termination of the transmission, even when a voice signal having the transmission restriction information attached thereto is received from another terminal device during transmission of the voice signal.

13. The voice communication system according to claim 3 , wherein the terminal device is configured to continue transmission of a voice signal until termination of the transmission, even when a voice signal having the transmission restriction information attached thereto is received from another terminal device during transmission of the voice signal.

14. The voice communication method according to claim 6 , wherein the terminal device is configured to continue transmission of a voice signal until termination of the transmission, even when a voice signal having the transmission restriction information attached thereto is received from another terminal device during transmission of the voice signal.

15. The voice communication method according to claim 7 , wherein the terminal device is configured to continue transmission of a voice signal until termination of the transmission, even when a voice signal having the transmission restriction information attached thereto is received from another terminal device during transmission of the voice signal.

16. The voice communication method according to claim 6 , wherein in a case where the number of simultaneous receptions in the server device has reached the predetermined restriction value, the first terminal device and the second terminal device are configured to perform alternate communication in which after transmission of a voice signal by the first terminal device is terminated, the second terminal device is configured to start transmission of a voice signal, and after transmission of the voice signal by the second terminal device is terminated, the first terminal device is configured to start transmission of a voice signal.

17. The voice communication method according to claim 7 , wherein in a case where the number of simultaneous receptions in the server device has reached the predetermined restriction value, the first terminal device and the second terminal device are configured to perform alternate communication in which after transmission of a voice signal by the first terminal device is terminated, the second terminal device is configured to start transmission of a voice signal, and after transmission of the voice signal by the second terminal device is terminated, the first terminal device is configured to start transmission of a voice signal.

18. The voice communication method according to claim 8 , wherein in a case where the number of simultaneous receptions in the server device has reached the predetermined restriction value, the first terminal device and the second terminal device are configured to perform alternate communication in which after transmission of a voice signal by the first terminal device is terminated, the second terminal device is configured to start transmission of a voice signal, and after transmission of the voice signal by the second terminal device is terminated, the first terminal device is configured to start transmission of a voice signal.