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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| 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 Implications process universal |
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