Vien Thong Voip LTD Address: No 10, Le Quy Don Street, Bach Dang Ward, Hai Ba Trung District, Ha Noi City Enterprise code: 0101937367 Phone: 02439714980 Representative: Do Huu Hinh Adress: No 30, Lane 30, Yen Phu Street, Yen Phu Ward, Tay Ho District, Ha Noi City Bach Dang Ward, Hai Ba Trung District, Ha Noi CityFounding date: 11 - 5 - 2006