My project makes a outbound call, Local -> DAHDI / PRI Out / Once the call is answered, I am using AMD() to detect Answer Machine versus Human. The problem I must overcome is that I need to be able to Wait for the Beep, so that I precisely when to start playing my sound files on the Answer Machine.
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The technique is just easy. You should detect the noise in certain of time. If there is noice within that time range, then it must be a human voice. Otherwise is an answering machine.