ringing control 中文意思是什麼
ringing control
解釋
振鈴調整-
Control leads that come from 1a2 key telephone sets to operate features like flashing of lights to indicate on hold, line ringing, etc
控制引導，來自1a2按鍵式電話，設置用於一些操作功能，如燈的閃爍用來表示摘機或線路振鈴等等。
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