| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YDN 038.1-1999 | English | 759 |
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Specifications of Signalling System No. 7 - Isdn User Part
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YDN 038.1-1999
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YDN 038.1-1999
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