| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 1522.4-2009 | English | 789 |
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Days<=5
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Technical Requirements for Session Initiation Protocol. Part 4: SIP’s Applications about call control Based on Softswitching Network
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YD/T 1522.4-2009
| Valid |
YD/T 1522.4-2009
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