Nippon Telegraph And Telephone Corp is a provider of fixed and mobile voice related services, regional communications services, long distance and international communications business, data communications business and other business. The Company operates in five segments. Mobile Communications segment conducts mobile voice related services and sale of telecommunications equipment. Regional Communications segment provides fixed voice related services and other services. Long Distance and International Communications segment comprises fixed voice related services and international communications services, solution and other services. Data Communications segment comprises system integration services and network system service. Other segment comprises real estate rentals, financial business, systems development and other services related to research and development.