1. Construction unit: China Communications Service Co., Ltd., China Communications Construction Group Co., Ltd., responsible for technology and project management, and provincial telecommunications engineering bureaus.

2. Major communication research institutes: for example, the former Institute of Telecommunications of the Ministry of Information Industry.

3. Communication consulting design units: such as Zhongxun Design Institute (Zhengzhou ministerial level), Beijing Design Institute (Beijing ministerial level), Guangdong Telecom Design Institute, Zhejiang Huaxin Institute, etc.