...- Dterm 专用线路(Private Lines) 按键呼叫(Push button Calling) 按键呼叫-仅限话务台(Push Button Calling - Attendant) 按键与脉冲之间转换 Push Button To Rotary Conversion 基于 Q-SIG 呼叫 - ETSI Q-SIG Circuit Switched Basic Call-ETSI Versi...
基于4个网页-相关网页
Push Button Calling Attendant Only 按钮呼叫仅限话务台
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