Asterisk 所有的通道变量名称

Asterisk 通道变量 ${ACCOUNTCODE}: 用户计费帐号 sip.conf 里的 account=XXXX
${ANSWEREDTIME}: 通话时长(秒)
${BLINDTRANSFER}: 通道是否为转接类型
${CALLERID(all)}: 主叫用户名(主叫ID) 格式 name(123454)
${CALLERID(name)}: 主叫用户名 sip.conf 里的 username=XXXX
${CALLERID(num)}: 主叫号码sip.conf 里的 callerid=XXXX
${CALLINGPRES}: PRI Call ID Presentation variable for incoming calls (See callingpres )
${CHANNEL}: 当前通道标识
${CONTEXT}: 当前context
${DATETIME}: 当前日期时间
${DIALEDPEERNAME}: Name of the called party. Broken for now, see DIALEDPEERNAME
${DIALEDPEERNUMBER}: Number of the called party. Broken for now, see DIALEDPEERNUMBER
${DIALEDTIME}: Time since the number was dialed (only works when dialed party answers the line?!)
${DIALSTATUS}: 当前通道状态
${DNID}: 用户所拨打的号码
${EPOCH}: The current UNIX-style epoch (number of seconds since 1 Jan 1970)
${EXTEN}: 当前所拨打分机号码
${HANGUPCAUSE}: The last hangup return code on a Zap channel connected to a PRI interface
${INVALID_EXTEN}: The extension asked for when redirected to the i (invalid) extension
${LANGUAGE}: 提示语言
${MEETMESECS}: Number of seconds a user participated in a MeetMe conference
${PRIORITY}: The current priority

${RDNIS}: The current redirecting DNIS, Caller ID that redirected the call. Limitations apply, see RDNIS
${SIPDOMAIN}: SIP destination domain of an inbound call (if appropriate)
${SIP_CODEC}: Used to set the SIP codec for a call (apparently broken in Ver 1.0.1, ok in Ver. 1.0.3 & 1.0.4, not sure about 1.0.2)
${SIPCALLID}: The SIP dialog Call-ID: header
${SIPUSERAGENT}: The SIP user agent header
${TIMESTAMP}: Current date time in the format: YYYYMMDD-HHMMSS This is deprecated as of Asterisk 1.4, instead use :${STRFTIME(${EPOCH},,%Y%m%d-%H%M%S)})
${TRANSFERCAPABILITY}: 通道类型。是否可以转接
${TXTCIDNAME}: Result of application TXTCIDName (see below)
${UNIQUEID}: 当前唯一标识
${TOUCH_MONITOR}: used for "one touch record" (see features.conf, and wW dial flags).

更多参考：

asterisk使用之Channel Variables (通道变量)：http://blog.chinaunix.net/u2/74590/showart_2186999.html http://blog.chinaunix.net/u2/74590/showart_2186999.html

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