| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 1388.4-2005 | English | 709 |
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Days<=4
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Technical requirements of the soft switch based services. Part 4: Multiparty call services
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YD/T 1388.4-2005
| Valid |
YD/T 1388.4-2005
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