在Asterisk常見的DTMF問題和解決辦法

1、在Asterisk常見的DTMF問題和解決辦法兩個用戶在通話的時候怎么獲取DTMF按鍵Q:IwanttoknowifitispossibleinAsterisktocatchaDTMFeventsentbyoneofthephonetotriggeranaction,forexampletoplayasound/videocliptooneofthephones.A:Googleforfeatures,conf,butyou*11needtokeepasteriskinthecallpath,i.e.canreinvite=no,otherwisetheRFC2833DTMFcodeswill

2、onlybesentbetweentheendpoints.Ifyouneedtoreinvite,thenyoumighthavetotryusingSIP-INFOforDTMFinsteadofRFC2833.檢測DTMF按健音的長度？Q:Here'sthescenario,IamplanningtouseSIPphonetoconnectasterisklocalextensionnumberwhereitwillconnectmetomyagiserver.Myagiserver(writteninjava)asofnowcandetectandprintsdtmftones

3、butnotthedtmfdonebyprolongedkeypressed.A:AsofAsterisk1.4,ifyouuseRFC2833-generatedDTMF,thenitispossible.ItwouldalsobepossibleinanyversionwithinbandDTMF(whichrequiresulaworalaw).Allothercases,itisonlypossibletoknowthattheeventoccurred,nothowlongtheeventlasted.向電話會議用戶廣播DTMF按健Q:HowcanIarrangetheability

4、forMeetMeparticipantstopressDTMFkeysontheirphoneandforthetonestothenpassouttotheotherparty(ies)?A:Thepseudozapchannels-that*swhatallVOIPchannelshavetousetogetintoaMeetMe一can'tdoDTMFwithanymeasureofreliabilityatall.SowhatIdidwasprogramintoapp_conferencetheabilitytodoDTMFbroadcastingofbothinbandan

5、dRFCDTMF.ThebroadcastDTMFportionwilldoaseparatesendtoeachoftheparticipantsthathastheflagsetforRFCandforinbandflaggedparticipantsitwillgotoasectionthatwillplayanaudiofileofaDTMFtone(toallowforSIPRFCparticipantstosendDTMFtoinbandZapparticipantsforexample).Itdoesstillhavearandomdouble-freememorythatIca

6、n'tfindanyonetofixwhichwillcrashAsteriskifyouuseinbandDTMFbroadcastingalot,butithasworkedformeforperiodsoftimeaslongas2weekswithoutcrashing.(QuoteasofSep2021)TodoDTMFbroadcasting,makesureyoureadtheREADMEwhichhasinstructionsontheflagsforConferenceinthedialplan.修改DTMF長度Q：在哪里調(diào)整，怎樣才能調(diào)整DTMF長短？A:main/

7、channel.c,include/asterisk/channel.h:2021-04-2421:34+0000r61781-61787RussellBryant(Asterisk1.4.3)ImproveDTMFhandlinginast_read0evenmoreinresponsetoadiscussionontheasterisk-devmailinglist.Ichangedtheenforcedminimumlengthofadigitfrom100msto80ms.Furthermore,Imadeitnowenforceagapof45msinbetweendigits.Th

8、esevaluesarenotconfigurableinaconfigurationfilerightnow,buttheycanbeeasilychangednearthetopofmain/channel,c.電話會議中的DTMF處理問題：MeetMe會議可以將一個用戶的DTMF按鍵轉(zhuǎn)發(fā)給其他用戶嗎？回答：Asterisk1.4hasintroducedanewoption'F'inMeetMethatservesthispurpose.手工提取和發(fā)送DTMF數(shù)字Q:rmtryingtomakeasteriskdetectsomeDTMFdigitsduringacall

9、andpostthem(can'tuseWaitExtenorFeatures,conf).A:Iwouldsuggestthatyouimplementthatinlogger.candconfigurealinetosendlogstoanHTTPPOST(vialogger,conf),withthepbx_substitute_variables_helperfunction,usingthe$CURL()functiondirectly.Youmayneedto=>func_curl.soinmodules,conf,butthatwillworkwell.Orusea

10、simplelogwatcher：tail-n0-f/var/log/asterisk/debuggrep'DTMFdigit：'your_custum_filter解決常見故障的辦法* 激活debug模式，讓AsteriskCLI能夠接到DTMF事件通知。(不知道怎么做？看下面這個問題的回答)* 錄制聲音(使用ztmonitor),在聲音文件里確信Asterisk得到了有效的DTMF按鍵。問題：當(dāng)我從L2升級到1.4.13之后，CLI不再顯示DTMF了。我需要激活它嗎？答案：你需要在logger,conf里修改允許DTMF按鍵，然后在AsteriskCLI里面輸入reload

11、來讓你的這個修改生效。在Zap(PRI/El)上接收一個DTMF字符(Asterisk1.4)引用CLI>coresetdebugchannelZap/ITJul3013:19:05«TYPE:DTMFBegin(12)SUBCLASS:5(53)Zap/1-1Jul3013:19:05«TYPE:NullFrame(5)SUBCLASS:N/A(0)Zap/1-1Jul3013:19:05«TYPE:NullFrame(5)SUBCLASS:N/A(0)Zap/1-1Jul3013:19:05«TYPE:NullFrame(5)SUBCLASS:

12、N/A(0)Zap/1-1Jul3013:19:05«TYPE:NullFrame(5)SUBCLASS:N/A(0)Zap/1-1Jul3013:19:05«TYPE:NullFrame(5)SUBCLASS:N/A(0)Zap/1-1Jul3013:19:05«TYPE:NullFrame(5)SUBCLASS:N/A(0)Zap/1-1Jul3013:19:06«TYPE:DTMFEnd(1)SUBCLASS:5(53)Zap/1-1帶內(nèi)DTMF檢測不可靠* Possiblesolution：Makesureyouhaveazapteltimer/

13、timingdevice,i.e.either'ztdummy*orsomezaptelhardwareonyoursystem.* Anotherpossiblesolution：Ifyourasteriskisntreliablyrecognizingdtmfandyou'reusingaproviderthatonlysupportsinbanddtmf,considerdumpingthemforanotherproviderthatcangiveyououtofbanddtmfsuchasRFC2833.Dependingonyoursituation,thismaybeaneasierfixthansomeothersolutions.Inbanddtmfdetectionseemstobeveryproblematic.重復(fù)收到DTMF按鍵* Changethesettingrelaxdtmf=andseeifthathelps* IfyouappeartobereceivingdoubledDTMFsignalsthenyouarelikelytogetbothinbandandRFC2833orSIPINFOsignallingonyourAsteriskbox;youwil