| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 3556-2019 | English | 139 |
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Days<=3
|
(Technical requirements for VoWiFi service interworking based on IMS)
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YD/T 3556-2019
| Valid |
YD/T 3556-2019
|