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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 1286-2003 |
Technical specification of supplement services for IP telephony ip电话补充业务技术要求 |
China Telecommunication
Standards Technical specification supplement |
 English PDF |
| YD/T 1087-2000 |
Technical Specification of ISDN User-network Interface (Supplementary Part to Support IP Access) isdn用户——网络接口规范（补充支持ip接入） |
China Telecommunication
Standards Technical specification supplement |
English PDF |
| YDN 034.4-1997 |
ISDN subscribers - specification for network interfaces. Part 4 Technical specifications for supplementary services (internal standard) isdn用户--网络接口规范 第4部分:补充业务技术规范 |
China Telecommunication
Standards Technical specification supplement |
English PDF |
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