circuit switched digital network
csdn circuit switched data network线路切换式数据网 csdn circuit switched digital network线路切换式数字网 csds communication signal distribution system通信旌旗灯号分配系统 ..
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circuit switched digital network
电路交换数字网
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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However, VOIP differs from the usual phone services in that it sends calls as digital packets of information over data networks rather than relying on a dedicated circuit-switched network.
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