深圳市奥德赛创精密仪器有限公司销售美国MONROE原装进口拨号音检测模块，型号：Model 90471A
90417a
Dial Tone Detection Module
The Model 90417A Module is a Dial Tone Detector. It is designed to be plugged directly into a Model 3137B Unattended Answering Device. The Model 90417A is intended for use on telephone exchanges where the central office does not provide a current interruption on calling party disconnect. Thus it provides a forced disconnect of the Model 3137B Unattended Answering
Device on return of Dial Tone
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深圳市奥德赛创精密仪器有限公司
宋先生
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