MULTIMEDIA COMMUNICATION DEVICE OR SYSTEM, VIDEO DISTRIBUTION SYSTEM, AND VIDEO CONFERENCE SYSTEM

摘要

PROBLEM TO BE SOLVED: To communicate also through a broadband rooter which has an address converter mechanism concerning the protocol on the UDP used in the data system in multimedia communication to transmit sounds and images through a network.

SOLUTION: A moving image terminal 103 transmits packets to a server 104 to generate a NAT table. Alternatively, without using the conventional method of deciding the destination port to send the multimedia data which a server sends in the control communication protocols such as RTSP, the IP address and the port number of the packet sender are used as the IP address and the port number of the destination of the contents the server 104 broadcasts, after waiting for receiving the packets from the moving image terminal 103 for generating a NAT table before the server 104 starts to broadcast the contents.

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