Voice Mail Detector (Vmd-01)

Some PSTN Central Offices offer on-line voice mail service. The voice message stays on server until user retrieves it. This service is different from terminal voice message device which records and stores message on user owns device like voice answer machine or some other telephone build in with this function.Usually the way that user knows he / she gets a voice mail message is to pickup the phone and when he / she hears there is stuttered dial tone instead of continuous dial tone. This results problems because without picking up the phone and listen, he / she will never knows whether there is a voice message or not.Voice mail detector (VMD-01) is designed for solving this problem. It works online and could auto monitoring the line to check whether there is mail message. If there is, the LED will light up and flashing. When user sees the visual LED indication, he / she knows immediately you have a voice mail so he / she will not miss it!

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