忙線回撥-Busy CallBack

內容表格

1. 內容異動
2. 功能操作流程
3. 使用的限制
4. 檔案說明
5. 參考連結

什麼是忙線回撥？
當分機A撥電話給分機B時，如果分機B一直在通話中，所以分機A每隔一段時間就要不斷的按重撥。現在如果在主機加上忙線回撥功能，當分機A遇到對方忙線時，只要按一個數字啟用忙線回撥，如果分機B講完電話，系統會主動回撥給分機A，然後當 A 接起電話後，系統又會再主動撥給分機B，這樣是不是大大節省了分機A作手動重撥的工作呢！

其實這樣的應用也不算新玩意，在一般辦公室的傳統交換機就已經有此功能，只是 Asterisk 內建竟沒有這個我覺得還蠻實用的 feature，既然將電話IP化了，使用上怎能比傳統的還遜，所以寫了這篇教學，讓玩家也可以更愉快的使用Asterisk。

內容異動

2009-04-30 修改extensions.conf 使語音"分機忙線中，如要預約，請按5" 在未輸入任何數字前可語音提示三次。
2009-04-30 更改提示語音的內容，並重錄製語音檔。

功能操作流程

當 A 撥電話給 B 時
A分機 -> B分機(忙線中) -> A 聽到語音提示：分機忙線中，如要預約，請按 5 -> A 按下 5 -> A 聽到語音提示：功能確定請掛上電話 -> A 掛斷電話(等待回撥)

當 B 講完電話時
系統自動回撥至 A分機 -> A 接起電話 -> 系統主動撥給 B分機 -> B 接起電話後與 A 通話

使用的限制

設定忙線回撥的分機，不可啟用 Voicemail 或 FollowMe。
此教學需要修改 extensions.conf 設定檔，如果有使用 FreePBX 套件，在作完套件升級後，部份修改的內容可能會遺失。

檔案說明

目錄位置	檔案名稱	說明
/etc/asterisk	extensions.conf	設定檔(修改)
/etc/asterisk	extensions_custom.conf	設定檔(修改)
/var/lib/asterisk/agi-bin	busy_callback.sh	AGI(新增)
/var/lib/asterisk/sounds	busy-callback.gsm (更新於2009-4-30)	語音檔(新增)
/var/lib/asterisk/sounds	busy-callback-ok.gsm (更新於2009-4-30)	語音檔(新增)

/etc/asterisk/extensions.conf
紅字區域是原始內容，將它們全部註解。

; Extensions with no Voicemail box reporting BUSY come here
;exten => s-BUSY,1,NoOp(Extension is reporting BUSY and not passing to Voicemail)
;exten => s-BUSY,n,Playtones(busy)
;exten => s-BUSY,n,Busy(20)

; The following is written by A.Lang
exten => s-BUSY,1,NoOp(Extension is reporting BUSY and set automatical CallBack)
exten => s-BUSY,2,ChanIsAvail(SIP/${MACRO_EXTEN}|s)
exten => s-BUSY,3,GotoIf($["${AVAILSTATUS}"<="1"]?s-NOANSWER,1)
exten => s-BUSY,4,Read(digit|busy-callback|1|i|3) ;Playback "busy-callback" before press digits and 3 attempts will be made.
exten => s-BUSY,5,GotoIf($["${digit}"="5"]?s-busy-callback,1 ;press 5 enable CallBack
exten => s-BUSY,6,Hangup

exten => s-busy-callback,1,AGI(busy_callback.sh,${CALLERID(number)},${MACRO_EXTEN})
exten => s-busy-callback,2,Playback(busy-callback-ok)
exten => s-busy-callback,3,Hangup

/etc/asterisk/extensions_custom.conf

[custom-auto-redial]
exten => _rdXXXXXX,1,NoOp(Redialed Call)
exten => _rdXXXXXX,2,Set(FROM=${EXTEN:2:3})
exten => _rdXXXXXX,3,Set(TO=${EXTEN:5:3})
exten => _rdXXXXXX,4,ChanIsAvail(SIP/${TO}|s)
exten => _rdXXXXXX,5,GotoIf($["${AVAILSTATUS}" <= "1"]?6:end)
exten => _rdXXXXXX,6,Set(CALLERID(all)="ReDial ${TO} <${TO}>")
exten => _rdXXXXXX,7,Dial(SIP/${FROM}|10)
exten => h,n(end),Hanghup

* 此範例僅適用以3位數字編碼的分機；如果是4位數的分機，部份內容修改如下：
_rdXXXXXX                         --> _rdXXXXXXXX
Set(FROM=${EXTEN:2:3})    --> Set(FROM=${EXTEN:3:4})
Set(TO=${EXTEN:5:3})        --> Set(TO=${EXTEN:7:4})

/var/lib/asterisk/agi-bin/busy_callback.sh

reference to undefined name 'syntax' Exception of type 'MindTouch.Deki.Script.Runtime.DekiScriptUndefinedNameException' was thrown. (click for details)

Callstack:
    at VoIP/IP_PBX/軟體式_IP_PBX/Asterisk_-_免費_IP_PBX_網路電話交換平台/Tips/忙線回撥-Busy_CallBack

MindTouch.Deki.Script.Runtime.DekiScriptUndefinedNameException: reference to undefined name 'syntax' Exception of type 'MindTouch.Deki.Script.Runtime.DekiScriptUndefinedNameException' was thrown.
  at MindTouch.Deki.Script.Compiler.DekiScriptExpressionEvaluation.Visit (MindTouch.Deki.Script.Expr.DekiScriptVar expr, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Expr.DekiScriptVar.VisitWith[DekiScriptExpressionEvaluationState,Range] (IDekiScriptExpressionVisitor`2 visitor, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Compiler.DekiScriptExpressionEvaluation.Evaluate (MindTouch.Deki.Script.Expr.DekiScriptAccess expr, DekiScriptExpressionEvaluationState state, Boolean evaluateProperties) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Compiler.DekiScriptExpressionEvaluation.Visit (MindTouch.Deki.Script.Expr.DekiScriptAccess expr, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Expr.DekiScriptAccess.VisitWith[DekiScriptExpressionEvaluationState,Range] (IDekiScriptExpressionVisitor`2 visitor, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Compiler.DekiScriptExpressionEvaluation.Visit (MindTouch.Deki.Script.Expr.DekiScriptCall expr, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Expr.DekiScriptCall.VisitWith[DekiScriptExpressionEvaluationState,Range] (IDekiScriptExpressionVisitor`2 visitor, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Compiler.DekiScriptExpressionEvaluation.Visit (MindTouch.Deki.Script.Expr.DekiScriptSequence expr, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Expr.DekiScriptSequence.VisitWith[DekiScriptExpressionEvaluationState,Range] (IDekiScriptExpressionVisitor`2 visitor, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0 
  at MindTouch.Deki.Script.Compiler.DekiScriptExpressionEvaluation.Visit (MindTouch.Deki.Script.Expr.DekiScriptReturnScope expr, DekiScriptExpressionEvaluationState state) [0x00000] in <filename unknown>:0

別忘了要加上可執行的權限
#>chmod 755 busy_callback.sh

;MR=18,RT=10 每10秒檢查一次，最多檢查18次

參考連結

http://www.voip-info.org/wiki/view/A...tips+Call+Back

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文件			大小	日期	附件上傳者
		busy-callback-ok.gsm busy-callback-ok	8.83 KB	22:47, 30 Apr 2009	alang	動作 Attach new version Edit description Move/rename Delete
		busy-callback.gsm busy-callback	6.83 KB	22:47, 30 Apr 2009	alang	動作 Attach new version Edit description Move/rename Delete

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