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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 2946-2015 |
(IMS-based VoLTE networks and 2G / 3G / 4G network voice service interworking technical requirements) 基于ims的volte网络与2g/3g/4g网络话音业务互通技术要求 |
China Telecommunication
Standards VoLTE |
 English PDF |
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