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传统的电话系统在交流电发生故障的情况下仍然可以正常使用。而在IP电话系统中,电话机通常是通过交流电源适配器供电的,因此当交流电故障时,电话机就不能使
Traditional telephone systems can still be used normally in the event of an AC failure. In IP telephone systems, the telephone is usually powered by the AC adapter so that the telephone can not make the AC power failure