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| 11. | Pertaining to the state in which a transmission control unit or audio response unit cannot accept incoming |
| 指传输控制设备或音频应答设备不能接受线路呼入的状态。 |
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| 12. | Pertaining to the state in which a transmission control unit or an audio response unit cannot accept |
| 指传输控制器或声音应答装置不能接收线路上的输入呼叫的状态。 |
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