| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 4149-2022 | English | 419 |
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Days<=4
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(Service technical requirements based on unified IMS (second stage) Number one multi-terminal service)
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YD/T 4149-2022
| Valid |
YD/T 4149-2022
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