COMMUNICATION SYSTEM AND COMPUTER PROGRAM PRODUCT

• US 20110158231A1
• Filed: 12/21/2010
• Published: 06/30/2011
• Est. Priority Date: 12/28/2009
• Status: Active Grant

• Current Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Original Assignee: Brother Kogyo Kabushiki Kaisha (Brother Industries Limited)
• Inventors: KUDO, Yasuhiro
• Granted Patent: US 8,908,568 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 12/1818 Conference organisation arrangements, e.g. handling schedules, setting up parameters needed by nodes to attend a conference, booking network resources, notifying involved parties
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 67/141 Setup of application sessions admission control or resource allocation in data switching networks H04L47/70

Abstract

A communication system includes a first communication terminal, a second communication terminal that has not established communication with the first communication terminal, and a third communication terminal that has established communication with the first communication terminal. The second communication terminal transmits to the first communication terminal a request packet that requests establishment of communication, and receives from the first communication terminal a permission packet that permits establishment of communication. The second communication terminal then establishes communication with the first communication terminal and performs communication with the first communication terminal. A second receiving device receives the request packet from the third communication terminal, after the first receiving device has received the permission packet from the first communication terminal; The second communication terminal transmits the permission packet to the third communication terminal, and establishes communication with the third communication terminal and performs communication with the third communication terminal.

Claims

1. A communication system comprising:

a first communication terminal that is connectable to a network;

a second communication terminal that is connectable to the network and that has not established communication with the first communication terminal; and

a third communication terminal that is connectable to the network and that has established communication with the first communication terminal;

wherein

the second communication terminal comprises;

a first transmitting device that transmits to the first communication terminal a request packet that requests establishment of communication;

a first receiving device that, after the first transmitting device has transmitted the request packet, receives from the first communication terminal a permission packet that permits establishment of communication;

a first communication device that, in a case where the first receiving device has received the permission packet from the first communication terminal, establishes communication with the first communication terminal and performs communication with the first communication terminal;

a second receiving device that receives the request packet from the third communication terminal, after the first receiving device has received the permission packet from the first communication terminal;

a second transmitting device that transmits the permission packet to the third communication terminal in a case where the second receiving device has received the request packet from the third communication terminal; and

a second communication device that, after the second transmitting device has transmitted the permission packet to the third communication terminal, establishes communication with the third communication terminal and performs communication with the third communication terminal;

the first communication terminal comprises;

a third receiving device that receives the request packet from the second communication terminal;

a third transmitting device that transmits the permission packet to the second communication terminal in a case where the third receiving device has received the request packet from the second communication terminal;

a third communication device that, after the third transmitting device has transmitted the permission packet to the second communication terminal, establishes communication with the second communication terminal and performs communication with the second communication terminal; and

a fourth transmitting device that, in a case where the third transmitting device has transmitted the permission packet to the second communication terminal, transmits to the third communication terminal a notification packet that notifies that establishment of communication with the second communication terminal is permitted; and

the third communication terminal comprises;

a fourth receiving device that receives the notification packet transmitted from the first communication terminal;

a fifth transmitting device that transmits the request packet to the second communication terminal in a case where the fourth receiving device has received the notification packet from the first communication terminal;

a fifth receiving device that receives the permission packet from the second communication terminal, after the fifth transmitting device has transmitted the request packet to the second communication terminal; and

a fourth communication device that, in a case where the fifth receiving device has received the permission packet from the second communication terminal, establishes communication with the second communication terminal and performs communication with the second communication terminal.

2. The communication system according to claim 1, wherein

the third transmitting device of the first communication terminal transmits to the second communication terminal the permission packet that is associated with predetermined key information;

the fourth transmitting device of the first communication terminal transmits to the third communication terminal the notification packet that is associated with the key information;

the fifth transmitting device of the third communication terminal transmits to the second communication terminal the request packet that is associated with the key information associated with the notification packet received from the first communication terminal; and

the second communication device of the second communication terminal performs communication with the third communication terminal in a case where the key information that is associated with the permission packet received from the first communication terminal by the first receiving device matches the key information that is associated with the request packet received from the third communication terminal by the second receiving device.

3. The communication system according to claim 1, wherein

the first communication terminal further comprises a first determination device that, in a case where the third receiving device has received the request packet from the second communication terminal, determines whether to permit establishment of communication with the second communication terminal based on information that is input by a user or that is stored beforehand, and

in a case where it is determined by the first determination device that establishment of communication with the second communication terminal is permitted, the third transmitting device of the first communication terminal transmits the permission packet to the second communication terminal, and the fourth transmitting device of the first communication terminal transmits the notification packet to the third communication terminal.

4. The communication system according to claim 1, wherein

the third transmitting device of the first communication terminal transmits to the second communication terminal the permission packet that is associated with identification information of the third communication terminal,

the second communication terminal further comprises:

a second determination device that, in a case where the first receiving device has received the permission packet from the first communication terminal, determines whether to permit establishment of communication with the third communication terminal based on information that is input by the user after notifying the user of the identification information or that is stored beforehand; and

a sixth transmitting device that, in a case where it is determined by the second determination device that establishment of communication with the third communication terminal is not permitted, transmits to the first communication terminal a stop packet that stops establishment of communication;

the first communication terminal further comprises

a sixth receiving device that receives the stop packet transmitted from the second communication terminal, and

the fourth transmitting device of the first communication terminal does not transmit the notification packet to the third communication terminal in a case where the sixth receiving device has received the stop packet from the second communication terminal.

5. The communication system according to claim 1, wherein

the fourth transmitting device of the first communication terminal transmits to the third communication terminal the notification packet that is associated with identification information of the second communication terminal,

the third communication terminal further comprises:

a third determination device that, in a case where the fourth receiving device has received the notification packet from the first communication terminal, determines whether to permit establishment of communication with the second communication terminal based on information that is input by the user after notifying the user of the identification information or that is stored beforehand; and

a seventh transmitting device that, in a case where it is determined by the third determination device that communication with the second communication terminal is not to be established, transmits to the first communication terminal a rejection packet that rejects establishment of communication; and

the first communication terminal further comprises;

a seventh receiving device that receives the rejection packet transmitted from the third communication terminal; and

a communication stop device that, in a case where the seventh receiving device has received the rejection packet from the third communication terminal, prohibits communication with the second communication terminal and cancels establishment of communication.

6. The communication system according to claim 1, further comprising

a session initiation protocol (SIP) server that is connectable to the network and that performs call control between the first communication terminal, the second communication terminal and the third communication terminal, using an SIP,

wherein

the first communication terminal transmits the permission packet to the second communication terminal via the SIP server, and transmits the notification packet to the third communication terminal via the SIP server;

the second communication terminal transmits the request packet to the first communication terminal via the SIP server, and transmits the permission packet to the third communication terminal via the SIP server; and

the third communication terminal transmits the request packet to the second communication terminal via the SIP server.

7. The communication system according to claim 1, wherein

the third communication terminal further comprises:

an eighth transmitting device that transmits the notification packet to the second communication terminal;

an eighth receiving device that receives one of the request packet and the notification packet from the second communication terminal; and

a storage control device that stores identification information of the second communication terminal in a table, in a case where the fifth transmitting device has transmitted the request packet to the second communication terminal, in a case where the eighth transmitting device has transmitted the notification packet to the second communication terminal, and in a case where the eighth receiving device has received one of the request packet and the notification packet from the second communication terminal; and

the fifth transmitting device of the third communication terminal transmits the request packet to the second communication terminal in a case where the identification information of the second communication terminal is not stored in the table.

8. A communication system comprising:

a first communication terminal that is connectable to a network;

a second communication terminal that is connectable to the network and that has not established communication with the first communication terminal; and

a third communication terminal that is connectable to the network and that has established communication with the first communication terminal;

wherein

the first communication terminal comprises;

a first transmitting device that transmits to the second communication terminal a request packet that requests establishment of communication;

a first receiving device that, after the first transmitting device has transmitted the request packet, receives from the second communication terminal a permission packet that permits establishment of communication;

a first communication device that, in a case where the first receiving device has received the permission packet from the second communication terminal, establishes communication with the second communication terminal and performs communication with the second communication terminal; and

a second transmitting device that, after the first receiving device has received the permission packet from the second communication terminal, transmits to the third communication terminal a notification packet that notifies that establishment of communication with the second communication terminal is permitted;

the second communication terminal comprises;

a second receiving device that receives the request packet from the first communication terminal;

a third transmitting device that transmits the permission packet to the first communication terminal in a case where the second receiving device has received the request packet from the first communication terminal;

a second communication device that, after the third transmitting device has transmitted the permission packet to the first communication terminal, establishes communication with the first communication terminal and performs communication with the first communication terminal;

a third receiving device that receives the request packet from the third communication terminal, after the third transmitting device has transmitted the permission packet to the first communication terminal;

a fourth transmitting device that transmits the permission packet to the third communication terminal in a case where the third receiving device has received the request packet from the third communication terminal; and

a third communication device that, after the fourth transmitting device has transmitted the permission packet to the third communication terminal, establishes communication with the third communication terminal and performs communication with the third communication terminal; and

the third communication terminal comprises;

a fourth receiving device that receives the notification packet transmitted from the first communication terminal;

a fifth transmitting device that transmits the request packet to the second communication terminal in a case where the fourth receiving device has received the notification packet from the first communication terminal;

a fifth receiving device that receives the permission packet from the second communication terminal, after the fifth transmitting device has transmitted the request packet to the second communication terminal; and

a fourth communication device that, in a case where the fifth receiving device has received the permission packet from the second communication terminal, establishes communication with the second communication terminal and performs communication with the second communication terminal.

9. The communication system according to claim 8, wherein

the first transmitting device of the first communication terminal transmits to the second communication terminal the request packet that is associated with predetermined key information;

the second transmitting device of the first communication terminal transmits to the third communication terminal the notification packet that is associated with the key information;

the fifth transmitting device of the third communication terminal transmits to the second communication terminal the request packet that is associated with the key information associated with the notification packet received from the first communication terminal; and

the third communication device of the second communication terminal performs communication with the third communication terminal in a case where the key information that is associated with the request packet received from the first communication terminal by the second receiving device matches the key information that is associated with the request packet received from the third communication terminal by the third receiving device.

10. The communication system according to claim 8, wherein

the second communication terminal further comprises a first determination device that, in a case where the second receiving device has received the request packet from the first communication terminal, determines whether to permit establishment of communication with the first communication terminal based on information that is input by a user or that is stored beforehand, and

the third transmitting device of the second communication terminal transmits the permission packet to the first communication terminal in a case where it is determined by the first determination device that establishment of communication with the first communication terminal is permitted.

11. The communication system according to claim 8, wherein

the second transmitting device of the first communication terminal transmits to the third communication terminal the notification packet that is associated with identification information of the second communication terminal,

the third communication terminal further comprises:

a second determination device that, in a case where the fourth receiving device has received the notification packet from the first communication terminal, determines whether to permit establishment of communication with the second communication terminal based on information that is input by the user after notifying the user of the identification information or that is stored beforehand; and

a sixth transmitting device that, in a case where it is determined by the second determination device that establishment of communication with the second communication terminal is not permitted, transmits to the first communication terminal a rejection packet that rejects establishment of communication; and

the first communication terminal further comprises;

a sixth receiving device that receives the rejection packet transmitted from the third communication terminal; and

a communication stop device that, in a case where the sixth receiving device has received the rejection packet from the third communication terminal, prohibits communication with the second communication terminal and cancels establishment of communication.

12. The communication system according to claim 8, further comprising

a session initiation protocol (SIP) server that is connectable to the network and that performs call control between the first communication terminal, the second communication terminal and the third communication terminal, using an SIP,

wherein

the first communication terminal transmits the request packet to the second communication terminal via the SIP server, and transmits the notification packet to the third communication terminal via the SIP server,

the second communication terminal transmits the permission packet to the first communication terminal and the third communication terminal via the SIP server, and

the third communication terminal transmits the request packet to the second communication terminal via the SIP server.

13. The communication system according to claim 8, wherein

the third communication terminal further comprises:

a seventh transmitting device that transmits the request packet to the second communication terminal;

a seventh receiving device that receives one of the request packet and the notification packet from the second communication terminal; and

a storage control device that stores identification information of the second communication terminal in a table, in a case where the fifth transmitting device has transmitted the request packet to the second communication terminal, in a case where the seventh transmitting device has transmitted the request packet to the second communication terminal, and in a case where the seventh receiving device has received one of the request packet and the notification packet from the second communication terminal; and

the fifth transmitting device of the third communication terminal transmits the request packet to the second communication terminal in a case where the identification information of the second communication terminal is not stored in the table.

14. A computer program product stored on a non-transitory computer-readable medium, comprising instructions for causing a computer of a communication terminal that is connectable to a network to perform the steps of:

transmitting to a first communication terminal a request packet that requests establishment of communication, the first communication terminal being another communication terminal with which the communication terminal has not established communication;

receiving from the first communication terminal a permission packet that permits establishment of communication, after the request packet has been transmitted;

establishing communication with the first communication terminal and performing communication with the first communication terminal in a case where the permission packet has been received from the first communication terminal;

receiving, after the permission packet has been received from the first communication terminal, in a case where there is a second communication terminal that is still another communication terminal that has established communication with the first communication terminal, the request packet transmitted from the second communication terminal, the first communication terminal transmitting to the second communication terminal a notification packet that notifies that establishment of communication with the communication terminal is permitted, after the first communication terminal has established communication with the communication terminal, and the second communication terminal transmitting the request packet to the communication terminal in a case where the second communication terminal has received the notification packet from the first communication terminal;

transmitting the permission packet to the second communication terminal in a case where the request packet has been received from the second communication terminal;

establishing communication with the second communication terminal and performing communication with the second communication terminal, after the permission packet has been transmitted to the second communication terminal; and

transmitting, after the permission packet has been received from the first communication terminal, in a case where there is a second terminal communication and a third communication terminal that is another of the communication terminals other than the first communication terminal and with which communication has been established, the notification packet that notifies that communication with the first communication terminal is permitted to the third communication terminal, the third communication terminal transmitting the request packet to the first communication terminal in a case where the third communication terminal has received the notification packet, the first communication terminal sending back the permission packet to the third communication terminal, and the first communication terminal and the third communication terminal establishing communication.