| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YDN 115.4-1999 | English | 2399 |
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Test specification for China intelligent network services (Mass calling service) (internal standard)
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YDN 115.4-1999
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YDN 115.4-1999
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