| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 1522.31-2009 | English | 419 |
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Days<=3
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Technical Requirements For Session Initiation Protocol. Part 3: Interworking between ISUP and SIP-Supplement 1
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YD/T 1522.31-2009
| Valid |
YD/T 1522.31-2009
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