摘要：本文介绍了VoLTE SBC容灾的背景,重点分析了SBC初始注册、重注册、主叫和被叫容灾倒换机制、标准信令流程,并对相关流程进行了实际验证,提出了一种快速遍历所有SBC的测试方法,可以大大缩短故障定位时间。
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