Nippon Telegraph and Telephone Corporation (NTT) is a provider of telecommunication services to the information and communication technology (ICT) market. It offers fixed and mobile voice related services, IP/packet communications services, sales of telecommunications equipment, system integration and other telecommunications-related services. The company's service portfolio includes intra-prefectural and inter-prefectural communications services, international communications services, mobile telephone services, related ancillary services and network system services. NTT operates through five reportable business segments, namely, Regional Communications Business segment, Long Distance and International Communications segment, Mobile Communications Business segment, Data Communications segment and the Other business. The company operates along with subsidiaries in Americas, Europe, Middle East Africa and Asia Pacific. NTT is headquartered in Tokyo, Japan.