Corporate Network System Using VoIP Technology
Takashi Maruyama · 2000
OVERVIEW: The rapidly growing pervasiveness of the Internet is dramatically increasing the amount of data conveyed through networks, including corporate networks. To reduce communication costs, the need for voice over Internet protocol (VoIP) technology is growing because it integrates voice and data for efficient transmission over IP networks. Hitachi has developed VoIP gateways for wide area networks (WANs). The NT-1000 gateway supports Common Channel Signaling System No. 7 (SS7) and the NT-40 supports the H.323 version 2 protocol. These gateways provide optimal corporate network solutions for small and large networks, solutions that meet the users’ needs. Hitachi used the NT-1000 gateway for rebuilding and expanding its own corporate network. From this expansion, we have acquired the know-how needed to build large-scale VoIP networks, and we are making use of this know-how to develop VoIP solutions for WANs. Jun’ichi Kojima Masami Oshita Koichi Kaneko Takashi Maruyama