Last Updated: 09-06-2007
aai = "string"
aaiexpr = "ECMAScript_Expression"
bridgeexpr = "ECMAScript_Expression"
cond = "string"
connecttimeout = "integer"
connecttimeoutexpr = "ECMAScript_Expression"
dest = "string"
destexpr = "ECMAScript_Expression"
expr = "ECMAScript_Expression"
maxtime = "integer"
maxtimeexpr = "ECMAScript_Expression"
name = "string"
transferaudio = "URI"
transferaudioexpr = "ECMAScript_Expression"
type = "string"/>
|busy||The party called refused the call.|
|far_end_disconnect||The completed call was terminated by the called party.|
|maxtime_disconnect||The completed call was terminated by the interpreter because the call duration reached the value of the maxtime attribute.|
|near_end_disconnect||The completed call was terminated by the caller.|
|network_busy||An intermediate network refused the call.|
|network_disconnect||The completed call was terminated by the network.|
|noanswer||There was no answer within the time specified by the connecttimeout attribute.|
|blind||The VoiceXML interpreter performs a blind transfer. Once the caller is handed off to the network, the caller's session with the VoiceXML application cannot be resumed. The VoiceXML interpreter throws a connection.disconnect.transfer event to the VoiceXML application.|
|bridge||The original caller resumes her session with the VoiceXML application that executed the transfer once the call initiated by the transfer terminates.|
The transfer element exposes the following shadow variables.
|The aai and aiexpr attributes are mutually exclusive.|
|The bridge and bridgeexpr attributes are mutually exclusive.|
|The connecttimeout and connecttimeoutexpr attributes are mutually exclusive.|
|The dest and destexpr attributes are mutually exclusive.|
|The maxtime and maxtimeexpr attributes are mutually exclusive.|
|The transferaudio and transferaudioexpr attributes are mutually exclusive.|
|The connecttimeout, connecttimeoutexpr, maxtime, maxtimeexpr, and transferaudio attributes apply to bridged transfers only.|
|To allow the user to terminate the call during a bridged transfer, include a grammar that contains the utterances and DTMF input that allow the user to terminate the call. If the user terminates the call by uttering or typing something in the grammar, the filled is executed, and the transfer item variable contains the value "near_end_disconnect". The example below includes a transfer grammar.|
|If you do not want the VoiceXML interpreter to listen for spoken or DTMF input during the transfer, set the inputmodes property to the appropriate value. The example below sets the inputmodes property to dtmf, so that voice input is ignored during the transfer.|
|Properties that accept time designations should be set to a non-negative real number followed by a time unit identifier - either "ms" for milliseconds or "s" for seconds. For example, "3s" represents 3 seconds; "3000ms" represents 3000 milliseconds, and "1.5s" represents 1.5 seconds.|
|Prior to revision 2, if the dest or destExpr attribute does not specify a destination with a prefix containing a valid transfer destination URI type (tel or "sip:"), then the transfer fails and the transfer form item is filled with "busy" or "near_end_disconnect". In revision 2, in that situation the interpreter throws error.connection.baddestination. In revision 3 and later, the interpreter throws error.unsupported.uri.|
|The type and bridge attributes are mutually exclusive. If both are specified, the VoiceXML interpreter throws error.badfetch.|
The following example requests a telephone number from the user, performs a bridged transfer to the number, plays back the duration of the call, and finally exits.
<?xml version="1.0"?> <vxml version="2.1" xmlns="http://www.w3.org/2001/vxml"> <var name="phone_number"/> <!-- get a phone number from the user --> <form id="get_number"> <field name="phone_number"> <prompt> What number do you wanna call? <audio src="http://naturalsound.svc.tellme.com/common-audio/intellipause.wav"/> </prompt> <grammar src="builtin:digits?length=10"/> <catch event="noinput nomatch"> Sorry. I didn't get that. <reprompt/> </catch> <filled> <!-- store the number at document scope to be used by the call_number dialog --> <assign name="document.phone_number" expr="'tel:+1' + phone_number"/> <goto next="#call_number"/> </filled> </field> </form> <!-- call the phone number specified by the caller --> <form id="call_number"> <block> <prompt>testing transfer</prompt> <log>calling: <value expr="phone_number"/></log> </block> <!-- must explicitly set bridge to true for bridged transfers --> <transfer name="theCall" destexpr="phone_number" connecttimeout="30s" type="bridge" transferaudio="http://naturalsound.svc.tellme.com/common-audio/intellipause.wav"> <!-- only allow DTMF input during this transfer --> <property name="inputmodes" value="dtmf"/> <prompt> transferring... <break size="small"/> Press star star to cancel. </prompt> <!-- the call is terminated when the user types star-star (**) --> <!-- the "abort" value is arbitrary. any syntactically legal value works so long as one is provided (#12832) --> <grammar mode="dtmf" root="root_rule" tag-format="semantics/1.0" type="application/srgs+xml" version="1.0"> <rule id="root_rule" scope="public"> <one-of> <item> <one-of> <item> * * </item> </one-of> </item> </one-of> </rule> </grammar> <filled> <log>transfer returned: <value expr="theCall"/></log> <if cond="theCall == 'busy'"> <prompt>The line was busy. Please try again later.</prompt> <elseif cond="theCall == 'noanswer'" /> <prompt>Noone is answering.</prompt> <elseif cond="theCall == 'network_busy'" /> <prompt>The network is busy!</prompt> <elseif cond="theCall == 'near_end_disconnect'" /> <prompt>The call was completed, and you terminated it with dtmf input.</prompt> <elseif cond="theCall == 'far_end_disconnect'" /> <prompt>The call was completed, and the callee terminated it.</prompt> <elseif cond="theCall == 'maxtime_disconnect'" /> <prompt>The call was completed, and it exceeded the maximum time allowed.</prompt> <elseif cond="theCall == 'network_disconnect'" /> <prompt>The call was completed, but it was terminated by the network.</prompt> </if> </filled> <error> <!-- receive notification of transfer failure --> <log><value expr="_event"/> occurred while attempting transfer to <value expr="theNumber"/>. </log> </error> </transfer> <block> <prompt>The call lasted approximately <value expr="Math.round(theCall$.duration)"/> seconds. </prompt> <!-- navigate to the main menu - or anywhere else. you can also disconnect to simulate a blind (non-bridging) transfer --> <exit /> </block> </form> </vxml>