Hanoi office: 7b7 Hanoi Horison Hotel 40 Catlinh st, Hanoi Vietnam
Tel: +84 7366461/62 Fax: 84 7366463 email: sontrahn@viettel.com.vn
Danang office: # Bãi Con, Bãi Nam, P.Thọ Quang, Đà Nẵng
Tel: 84 - 0511. 920 678 Fax: 84 - 0511. 831 604 Email: sontrajsc@dng.vnn.vn