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Terms for subject Telecommunications containing busy-back | all forms | in specified order only
EnglishChinese
back busy反向忙
back busy后向忙
busy back忙音
busy queuing/call back繁忙排队/自动回叫
busy-back占线信号
busy-back忙音信号
busy-back tone占线音
busy-back tone忙音

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