Vien Thong Intercom Viet Nam Joint Stock Company Address: No 18, Hang Ga Street, Hang Bo Ward, Hoan Kiem District, Ha Noi City Enterprise code: 0103973498 Phone: 02463299001 Representative: Nguyen Thi Minh Adress: 23a Civil Group, Phuc Xa Ward, Ba Dinh District, Ha Noi City Hang Bo Ward, Hoan Kiem District, Ha Noi CityFounding date: 19 - 6 - 2009