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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 1522.4-2009 |
Technical Requirements for Session Initiation Protocol. Part 4: SIP’s Applications about call control Based on Softswitching Network 会话初始协议（sip）技术要求 第4部分：基于软交换网络呼叫控制的sip协议 |
China Telecommunication
Standards SIP’s |
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