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Page last modified 17:47, 8 Aug 2012 by alang

DP+MySQL: AMD-Answering Machine Detection

    版本為 04:10, 27 Dec 2024

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    AMD - 這是一個內建 Asterisk 的功能，可用來偵測接電話的對方是語音或人聲。

    Dialplan 範例

    [amd-test]
exten => 9970,1,Noop(-- AMD Testing Start --)
 same => n,Background(beep)
 same => n,AMD()
 same => n,Noop(Detected: AMDSTATUS is ${AMDSTATUS})
 same => n,Goto(Status-${AMDSTATUS})
 same => n(Status-HUMAN),Noop(When AMDSTATUS  is <HUMAN>)
     same => n,    WaitForSilence(2500)
     same => n,Playback(    message-when-machine)
 same => n,Hangup
 same => n(Status-MACHINE),Noop(When AMDSTATUS  is <MACHINE>)
     same => n,Hangup
 same => n(Status-NOTSURE),Noop(When AMDSTATUS  is <NOTSURE>)
         same => n,Hangup
 same => n(Status-HANGUP),Noop(When AMDSTATUS is <HANGUP>)
     same => n,Hangup
    amd.conf
    ;
; Answering Machine Detection Configuration
;

[general]
initial_silence = 2500          ; Maximum silence duration before the greeting.
                                ; If exceeded then MACHINE.
greeting = 1500                 ; Maximum length of a greeting. If exceeded then MACHINE.
after_greeting_silence = 800    ; Silence after detecting a greeting.
                                ; If exceeded then HUMAN
total_analysis_time = 5000      ; Maximum time allowed for the algorithm to decide
                                ; on a HUMAN or MACHINE
min_word_length = 100           ; Minimum duration of Voice to considered as a word
between_words_silence = 50      ; Minimum duration of silence after a word to consider
                                ; the audio what follows as a new word
maximum_number_of_words = 3     ; Maximum number of words in the greeting.
                                ; If exceeded then MACHINE
silence_threshold = 256   ;silence threshold is how loud silence is.

    Tips:

    • silence_threshold: 這是用來辨識silence的音量基準值，只要偵測到聲音低於這個值，就視為 silence。通常這個值僅可能的低，對於有些手機的用戶，因為手機的噪音會比較大，可能要稍微將它調高。

    範例：不需 amd.conf

    [amd-without-conf]
exten => 7002,1,Answer()
exten => 7002,n,AMD(2500,1500,300,5000,120,50,4,384)
exten => 7002,n,GotoIf($["${AMDSTATUS}" = "MACHINE"]?machine:human)
exten => 7002,n(machine),Verbose(3, We found an answring machine)
exten => 7002,n,Set(AMP=${CALLERID(num)})
exten => 7002,n,Set(date=${STRFTIME(${EPOCH},,%Y%m%d-%H%M%S)})
exten => 7002,n,NoOp(Here is the dialplan you want to run)
exten => 7002,n(human),Verbose(3, We've got a human on the line!)
exten => 7002,n,NoOp(Here is the dialplan you want to run)
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