Icom Incorporated

Yoshiaki Miyakoshi

Yuma Oda

Akira Nakano

Hiroshi Kawasaki

A server system including a plurality of servers achieves redundancy on a per process basis. A first server and a second server execute a plurality of processes in parallel. Processes (B-, B-, and Br-) in the first server are active processes, and processes (B-, B-, and Br-) in the second server are standby processes. The active process periodically transmits an operation notification notifying normal operation, to the standby process. When no longer receiving an operation notification from the active process, the standby process switches an operation mode of the standby process from a standby mode to an active mode and starts provision of service of the process. The process switching is performed on a per process basis instead of on a per server basis.

Server system and redundancy method for processes

[Problem] To achieve a voice communication system which communicates between two networks that use partially overlapping address spaces. [Solution] According to the present invention, first and second networks are connected to one another by means of a gateway device provided with: a first protocol stack which manages transmission and reception addresses of communication packets in the first network; a second protocol stack which manages transmission and reception addresses of communication packets in the second network; and a call control unit which, upon reception of a communication packet from either network, determines the transfer destination network and transfer destination address of the packet on the basis of call destination information included in the packet.

Relaying device, method of relaying communication packet and voice communication system

A communication control device includes an association table updater and a correction packet transmitter. The association table updater updates, when receiving from a first wireless device a packet containing an identification number of a first communication terminal connected to the first wireless device, an association table storing an address of the first wireless device and the identification number of the first communication terminal. The correction packet transmitter transmits, when a packet received from a second wireless device to which a second communication terminal is connected contains an address of the second wireless device, an identification number of the second communication terminal, and an identification number indicating a destination of the packet, and when the identification number indicating the destination is the identification number of the first communication terminal stored in the association table, a correction packet containing the address of the second wireless device and the identification number of the second communication terminal to the first wireless device after the packet is transmitted to the first wireless device.

Growing community of inventors

Osaka, Japan

Yoshiaki Miyakoshi