COMMUNICATION METHOD, COMMUNICATION SYSTEM, AND TERMINAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a communication method, a communication system and a terminal device by which communication can be performed on the basis of an RTP/RTCP between terminal devices subordinate of different NAT devices.

SOLUTION: The terminal device 6 transmits a connection request packet to a terminal device 7 (101). A NAT device 3 stores a converted port number "23456" as history information in the NAT device 3 (104). A communication controller 2 transmits port numbers of the NAT devices 3 and 4 as NAT information to the terminal device 6 (119). The terminal device 6 transmits a port adjustment packet because the port number stored in the NAT device 3 is "23456" (even number) (127). The NAT device 3 stores "23457" (odd number) obtained by adding one to the "23456" (130). The terminal device 6 uses port numbers "23458" and "23459" to be able to perform communication based on RTC/RTCP.

COPYRIGHT: (C)2011,JPO&INPIT