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Nippon Telegraph and Telephone Corporation (NTT) is a provider of fixed and mobile voice related services, Internet protocol (IP)/packet communications services, sales of telecommunications equipment, system integration and other telecommunications-related services in Japan. NTT operates in five segments: regional communications business, which comprises fixed voice related services, IP/packet communications services, sales of telecommunications equipment and other services; long-distance and international communications business, which comprises fixed voice related services, IP/packet communications services, system integration and other services; mobile communications business, which comprises mobile voice related services, IP/packet communications services and other services; data communications business, which comprises system integration services, and other businesses, which comprises revenues from activities as building maintenance, and research and development1.

1. 1. http://www.google.com/finance?q=TYO:9432