DP+MySQL: AMD-Answering Machine Detection

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

;
; 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.

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)

客戶的範例：

[test-amd]
exten => 9991,1,NoCDR()
exten => 9991,n,Macro(amd-detection)
exten => 9991,n,Playback(demo-echotest)
exten => 9991,n,Echo()
exten => 9991,n,Playback(demo-echodone)
exten => 9991,n,Hangup
exten => h,1,Noop(Logging the Call details into the DB)
exten => h,n,Noop(AMDSTATUS: ${AMDSTATUS}, AMDCAUSE: ${AMDCAUSE})
exten => h,n,Noop(UNIQUEID: ${UNIQUEID}, CALLDATE: ${CALLDATE})
exten => h,n,MYSQL(Connect connid localhost root 123456 dialer)
exten => h,n,MYSQL(Query resultid ${connid} INSERT INTO `amd_log`(`calldate`,`uniqueid`,`amd_status`,`amd_cause`) VALUES ('${CALLDATE}','${UNIQUEID}','${AMDSTATUS}','${AMDCAUSE}'))
exten => h,n,MYSQL(Disconnect ${connid})


[macro-amd-detection]
exten => s,1,Noop(Answering Machine Detection - AMD)
exten => s,n,Set(CALLDATE=${STRFTIME(${EPOCH},,%Y-%m-%d %H:%M:%S)})
exten => s,n,Background(beep)
; Syntax: AMD([initialSilence][,greeting[,afterGreetingSilence[,totalAnalysis Time[,miniumWordLength  [,betweenWordSilence[,maximumNumberOfWords[,silenceThreshold[,maximumWordLength]]]]]]]])
exten => s,n,AMD(2500,1500,800,5000,120,50,4,256)
exten => s,n,Noop(AMDSTATUS: ${AMDSTATUS}, AMDCAUSE: ${AMDCAUSE})
exten => s,n,Noop(UNIQUEID: ${UNIQUEID}, CALLDATE: ${CALLDATE})
exten => s,n,GotoIf($["${AMDSTATUS}" = "MACHINE"]?machine:human)
exten => s,n(machine),Noop(We found an answering machine)
exten => s,n,Hangup
exten => s,n(human),Noop(We've got a human on the line)

參考連結

• voip-info: Answering Machine Detect (AMD)
• voip-info: Asterisk cmd BackGroundDetect
• asterisk.org: AMD
• asterisk-users: How to tune Asterisk AMD - Answering Machine Detection "hacks"
• asterisk-users: Voice Mail beep / tone detection