Established in 1988, Huawei Technologies is a high-tech enterprise which specializes in research and development (R&D), production and marketing of communications equipment, providing customized network solutions for telecom carriers in optical, fixed, mobile and data communications networks. Huawei's customers include China Telecom, China Mobile, China Netcom, China Unicom as well as Thai AIS, Telefonica, SingTel, Hutchison Telecom, PCCW HKT, SUNDAY, Etisalat (UAE), Telemar (Brazil), Rostelecom (Russia), etc. Huawei's contracted sales in 2003 reached 3.83 billion USD, an increase of 42% year on year.