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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 2459-2013 |
Test method of services based on the Unified IMS. IP Centrex service 基于统一ims的业务测试方法 ip centrex业务（第一阶段） |
China Telecommunication
Standards Centrex |
 English PDF |
| YD/T 1933-2009 |
Technical Requirements of Services Based on the Unified IMS IP Centrex Service(Release 1) 基于统一ims的业务技术要求 ip centerex业务（第一阶段） |
China Telecommunication
Standards Centrex |
English PDF |
| YDN 115.2-1999 |
Test specification for China intelligent network services (wide area Centrex) (internal standard) 中国智能网业务测试规范(广域集中用户交换机业务) |
China Telecommunication
Standards Centrex |
English PDF |
| YDN 030.2-1997 |
Code number and dialing procedure of universal personal telecommunication, wide area Centrex switch (WAC), vote of telephone (VOT) and mass calling (MAS) services (internal standard) 通用个人通信（upt)、广域集中用户交换机(wac)、电话投票(vot)和大众呼叫(mas)的编号和拨号程序 |
China Telecommunication
Standards Centrex |
English PDF |
| YDN 030.1-1997 |
Implications and process of universal personal telecommunication, wide area Centrex switch (WAC), vote of telephone (VOT) and mass calling (MAS) services (internal standard) 通用个人通信（upt)、广域集中用户交换机(wac)、电话投票(vot)和大众呼叫(mas)的业务含义和流程 |
China Telecommunication
Standards Centrex |
English PDF |
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