China communication construction bureau.

5. China Communication Construction Group is a large-scale information service construction enterprise with large scale, strong construction capacity and high technology content in China's communication construction field. It includes five sub-bureaus. They are Zhongtong Construction Group, Zhongtong Service, China Post and Telecommunications Equipment, China General Technology and Tongjian Fifth Bureau. China Communication Construction Group is one of the "window" enterprises for China Communication to go global, which has the function of developing overseas business, the right to operate foreign trade, the right to import and export labor services, and the task of national foreign economic aid and intergovernmental cooperation.