NETWORK COMMUNICATIONS SYSTEM

WIPO Patent Application WO/2019/038802

A1

The present invention reduces the connection mediation processing load, and performs communications with no trouble even if there is a problem with direct communication between terminals. The NAT type of routers to be used by each terminal (203A, 203B) is confirmed in advance, and stored in an address table (T60) of a connection mediation device (103). If a connection mediation request (S2) is transmitted from a communication origin (203A) to a communication mediation device (103) in order to start communication from the communication origin (203A) to a communication destination (203B), the communication destination address (AD2) and a communication method indicating normal communication or bypass communication are returned (S4a) in response thereto. If the NAT type of the communication destination (203B) is an asymmetrical type, normal communication is indicated, and direct communication (S7) is carried out between the terminals. If the NAT type of the communication destination (203B) is a symmetrical type, bypass communication is indicated and a bypass communication processing unit (273A, 273B) of each terminal carries out indirect communication (S8a, S8b) through a bypass communication relay unit (143).

OOKI TADASHI (JP)
YANO YOSHIHIRO (JP)
OGAWA TAKASHI (JP)
NAKATANI SHINNOSUKE (JP)
KATOU DAIKI (JP)
TAJI KAZUKI (JP)
OKANO TAKUYA (JP)
NAKAI TOSHIYUKI (JP)
HACHIKI SHIGEO (JP)
ITOH NORIAKI (JP)

PCT/JP2017/029765

February 28, 2019

August 21, 2017

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DAINIPPON PRINTING CO LTD (JP)

H04L12/70

JP2009206601A	2009-09-10
JP2013138398A	2013-07-11
JP2003169075A	2003-06-13

SHIMURA Hiroshi (JP)

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