Properties are used to set values that affect platform behavior. Properties
apply to their parent element and all the descendants of the parent. A property
at a lower level overrides a property at a higher level.
Note that properties are not case-sensitive.
|
Property
|
Description
|
Default
Value
|
|
confidencelevel
|
Specifies the
speech recognition confidence level. Values range from 0.0 (minimum
confidence) to 1.0 (maximum confidence). Recognition results are rejected (a nomatch event is thrown) if the confidence level of
the results is below this threshold.
|
0.5
|
|
sensitivity
|
Specifies the
level of sensitivity to speech. Values range from 0.0 (least sensitive to
noise) to 1.0 (highly sensitive to quiet input).
|
0.5
|
|
speedvsaccuracy
|
A hint
specifying the desired balance between speed vs. accuracy when processing a
given utterance. Values range from 0.0 (fastest recognition) to 1.0 (best
accuracy).
|
0.5
|
|
completetimeout
|
The length of
silence required following user speech before the speech recognizer finalizes
a result (either accepting it or throwing a nomatch event). The completetimeout is used when the
speech is a complete match of an active grammar and no further words can be
spoken. (Not used if com.voicegenie.tddparaminuse is set to true.)
|
0.4s
|
|
incompletetimeout
|
The length of
silence required following user speech before the speech recognizer finalizes
a result (either accepting it or throwing a nomatch event). In contrast to completetimeout, the incompletetimeout is used when
the speech is an incomplete match to an active grammar, or when the speech is
a match but it is possible to speak further. May not work correctly if set to
10s or more. (Not used if com.voicegenie.tddparaminuse is set to true.)
|
1s
|
|
maxspeechtimeout
|
The maximum
duration of user speech. If this time elapsed before the user stops speaking,
the maxspeechtimeout event is thrown.
- SpeechWorks allows values in
{1ms,99999ms}
- For Watson, 0 means no limit
|
20s (OSR)
0 (Watson)
|
|
maxnbest
|
Maximum
number of results returned by the recognizer. Also represents the maximum
size of the application.lastresult$[i] array.
With the com.voicegenie.STRICTCONFORMANCE property set to FALSE), the application.lastresult$ array may be filled with more results than
specified by this property (if more results are available from the ASR
engine).
|
1
|
|
asrinittimeout
(extension)
|
The maximum
length of time for ASR loading. (Note that "ASR loading" is not the
same as "grammar loading". Instead, it has to do with the engine getting
ready for ASR sessions. The platform may be configured for this to happen
only at the beginning of the first recognition session, or once for each
recognition session.) If the maximum is reached, an error.asr will be thrown.
|
30s
|
|
Property
|
Description
|
Default
Value
|
|
inputmodes
|
Determines
which input methods to use. Value is a space separated list of input methods:
- dtmf - allows DTMF sequences
as input
- voice - allows voice as input
- tdd - allows TDD as input
(extension; only supported if the platform is provisioned with the Dialogic
TDD recognizer).
|
dtmf voice
|
|
timeout
|
Once the
prompt has finished playing, the length of time to wait, if no speech or dtmf
input occurs, before throwing a noinput event.
|
10s
|
|
universals
|
Specifies
universal command grammars to activate. Value is a space-separated list of
all or fewer of the following command grammars:
- cancel - If this grammar is
activated, and the caller says "cancel" (or equivalent phrase
configured for another language), the
cancel event is thrown.
- exit - If this grammar is
activated, and the caller says "exit" (or equivalent phrase
configured for another language), the
exit event is thrown.
- help - If this grammar is
activated, and the caller says "help" (or equivalent phrase
configured for another language), the
help event is thrown.
A setting of "none" disables universal commands. A
setting of "all" can be used as a short form for activating all 3
command grammars.
|
none
|
|
asrengine
(extension)
|
Specifies the
name of the ASR (Automatic Speech Recognition) engine to use. The name is
configured in the VXML 2.0 Provisioning text field through the Media Server
> VXML page in the Web UI.
It is valid
to specify a particular engine only if that engine is installed for the
platform running the application. Otherwise, an error.asr.unknownengine event will be thrown.
See the IP Media Server Release Notes for the list of currently supported
engines and languages.
Note: The
configured name for SpeechWorks OSR must be "SPEECHWORKS",
otherwise a recognition error will occur.
|
platform-specific
|
|
ttsengine
(extension)
|
Specifies the
name of the TTS (Text-to-Speech) engine to use (i.e. the voice). The name is
configured in the VXML 2.0 Provisioning text field through the Media Server
> VXML page in the Web UI.
It is valid
to specify a particular engine only if that engine is installed for the
platform running the application. Otherwise, an error.tts.unknownengine event will be thrown.
|
platform-specific
|
|
com.voicegenie.grammartype.<asrengine>
For example:
- com.voicegenie.grammartype.speechworks
- com.voicegenie.grammartype.watson
(extension)
|
Changes the
grammar type to be used as the inline default when using <asrengine>,
so that the specified grammar type can be used without including the type attribute. It is valid to specify a
particular grammar type only if the <asrengine> supports that
grammar type.
|
platform-specific
|
|
endbeep
(extension)
|
Specifies
whether or not a beep should be played at the end of prompts in fields, when
bargein is disabled. When bargein is enabled, this attribute has no effect
(there is never a beep).
|
false
|
|
com.voicegenie.fieldobject
(extension)
|
Specifies the
format used when a set of slot/value pairs to a field name or <name>$.interpretation variable, or to the application.lastresult$[i].interpretation variables. If set to
true, each applicable variable is set to an ECMAScript object, containing a
property for each slot name, and a property value for each corresponding slot
value. If set to false, they will be set to strings with the format
+[?]slot1:value1[:score1]+[?]slot2:value2[:score2]+...
Note: This
property does not affect variables that are being assigned a single string
value, rather than a set of slot/value pairs.
|
true
|
|
com.voicegenie.saveutterance
(extension)
|
Set to true
to enable user utterance to be recorded. Set to false otherwise. Upon
completion of user input, the shadow variables that may be set are utteranceaudio/recording, size, and duration.
Note: With
the implementation of the VoiceXML 2.1 recordutterance property, the use of this property is
discouraged.
|
false
|
|
com.voicegenie.utterancedest
(extension)
|
Specifies the
path of the directory to use for saved utterance audio files. The value will
be resolved relative to the /usr/local/phoneweb/utterance/ directory. Can be
used with either the com.voicegenie.saveutterance or recordutterance property.
|
files are
written to the tmp directory (may or may not be saved)
|
|
recordutterance
(VoiceXML 2.1
feature)
|
This property
tells the platform to enable recording while simultaneously gathering input
from the user. Set to true to enable user utterance to be recorded. Set to
false otherwise. Upon completion of user input, the shadow variables that
will be set are recording, recordingsize, and recordingduration. Note that the <vxml> version attribute must be specified as 2.1 (or higher) to use this
property.
|
false
|
|
recordutterancetype
(VoiceXML 2.1
feature)
|
This property
specifies the audio format to use for recording utterances. Only used with
the recordutterance property. VoiceGenie
currently supports the following types:
- audio/basic - Raw
(headerless) 8kHz 8-bit mono mu-law [PCM] single channel. (G.711)
- audio/x-alaw-basic - Raw
(headerless) 8kHz 8-bit mono A-law [PCM] single channel. (G.711)
- audio/x-wav - WAV (RIFF
header) 8kHz 8-bit mono mu-law [PCM] single channel.
- audio/x-wav - WAV (RIFF
header) 8kHz 8-bit mono A-law [PCM] single channel.
|
audio/basic
|
|
com.voicegenie.asr.get_swi_literaltimings
(extension)
|
Set to true
to allow the special OSR variable, SWI_literalTimings, to be accessed through
the application.lastresult$ variable. (Requires com.voicegenie.fieldobject to be set to true.)
See SWI_literalTimings
for more details. (Available with SpeechWorks ASR only.)
|
false
|
|
swiep_*/swirec_*
(extension)
|
Many of OSR's
swiep_*/swirec_* configuration parameters can also be set as VoiceXML
properties.
To find out
whether a particular parameter can be set as a property, look it up in the
OSR Reference Manual. If the line under the parameter name includes
"API" (and if the description mentions SWIepSetParameter() or SWIrecRecognizerSetParameter()), then it can be set
as a property.
Some of the
parameters that are commonly used are:
- swirec_suppress_event_logging
- swirec_suppress_waveform_logging
- swirec_audio_environment (OSR
2.0+ only)
- swirec_backward_compatible_confidence_scores
(OSR 2.0+ only)
(Available with SpeechWorks OSR only.)
|
parameter-specific
|
|
com.voicegenie.serverselect
(extension)
|
Specifies the
IP address of a particular ASR server to switch to, or the name of a configured
group of ASR servers from which to pick a server to switch to. (Available
with SpeechWorks OSR 2.0+ only.)
|
(no default
value)
|
|
com.att.asr.useActive
(extension)
|
Set to false
to support large directory/grammar enhancement to the Watson engine. This
property can only be defined in the platform defaults file. (Available
with Watson ASR only.)
|
false
|
|
Property
|
Description
|
Default
Value
|
|
bargein
|
Controls
whether or not user input can be collected before prompts have finished
playing:
- true - Any user input can
barge in during prompts.
- false - No user input can
barge in during prompts.
- dtmf - Only DTMF input can
barge in during prompts; speech input is ignored until the completion of
the prompts; both speech and DTMF input can be collected after the
completion of the prompts.
With the com.voicegenie.STRICTCONFORMANCE property set to FALSE, a prompt with bargein="true" will cause bargein to
remain enabled for all the remaining queued prompts, within a given input
item.
|
true
|
|
bargeintype
|
Specifies the
bargein type:
- energy - Any noise can barge
in the prompt.
- speech - Any user utterance
can barge in the prompt.
- recognition - Only user input
that matches a grammar can barge in on the prompt.
- hotword (equivalent to
recognition) - Only user input that matches a grammar can barge in on
the prompt.
Note: Not all
bargeintypes are supported with all ASR engines.
|
speech
|
|
bargeinlevel
(extension)
|
The
confidence level required for bargein to work. Values range from 0.0 (minimum
confidence) to 1.0 (maximum confidence). (Available with Watson ASR only;
applied to portions of utterances that have been labeled with _BargeIn syntax to allow them to trigger bargein.)
|
0.5
|
|
com.voicegenie.recognitionbargeinminimum
(extension)
|
Minumum
duration of the bargein phrase if bargeintype is set to
recognition. (Value must be 0s-2s.)
|
0.3s
|
|
com.voicegenie.recognitionbargeinmaximum
(extension)
|
Maximum
duration of the bargein phrase if bargeintype is set to
recognition. (Value must be 0.5s-10s.)
|
1.7s
|
|
Property
|
Description
|
Default
Value
|
|
com.voicegenie.wakeupword
(VoiceGenie
extension)
|
Specifies
whether or not Wakeup Word Spotting should be used for input in fields,
menus, and initials. If set to true, recognition is only performed if input
length is between a minimum and maximum length, and (only with Nuance OSR 2.0+)
if input matches a grammar.
[Available
with ScanSoft (previously Nuance) OSR only.]
|
false
|
|
com.voicegenie.wakeupwordminimum
(VoiceGenie
extension)
|
If com.voicegenie.wakeupword is set to true, this specifies
the minimum length that input must be in order for recognition to be
performed.
|
|
|
com.voicegenie.wakeupwordmaximum
(VoiceGenie
extension)
|
If com.voicegenie.wakeupword is set to true, this
specifies the maximum length that input may be in order for recognition to be
performed.
|
|
|
com.voicegenie.wakeupwordranges
(VoiceGenie
extension)
|
Specifies
range(s) of input lengths that trigger(s) recognition to be performed, if com.voicegenie.wakeupword is set to true. The
value must have the following format:
min1[ms|s]-max1[ms|s],...,minn[ms|s]-maxn[ms|s]
where
mini and maxi are integers; mini must be less than maxi; - the unit (
ms or s) is optional (the default is
milliseconds)
Note: If all
three of the wakeupword length properties are specified, then com.voicegenie.wakeupwordranges will take precedence
over the others.
This is not
supported with ScanSoft (Nuance) OSR 2.0+.
|
|
|
Property
|
Description
|
Default
Value
|
|
COM.VOICEGENIE.ASR.Recognition-Mode
(VoiceGenie
extension)
|
Set to
'hotword' to enable the OSR selective barge-in or magic word
recognition mode:
- Selective Barge-in: Only user
input that matches a grammar can barge in on the prompt. (This mode is
enabled if
COM.VOICEGENIE.ASR.Hotword-Max-Duration is set to 0.)
- Magic Word: Only user input
that matches a grammar, and whose duration is between a minimum and
maximum length, can barge in on the prompt.
For example:
<property name="COM.VOICEGENIE.ASR.Recognition-Mode" value=""hotword""/>
(Available
with ScanSoft (Nuance) SWMS 3.1.4+ only.)
|
|
|
COM.VOICEGENIE.ASR.Hotword-Min-Duration
(VoiceGenie
extension)
|
If COM.VOICEGENIE.ASR.Recognition-Mode is set to hotword,
this specifies the minimum length (in ms) that input must be in order for
recognition to be performed. For example:
<property name="COM.VOICEGENIE.ASR.Hotword-Min-Duration" value=""50""/>
If COM.VOICEGENIE.ASR.Hotword-Max-Duration is set to 0, this
property will be ignored.
|
|
|
COM.VOICEGENIE.ASR.Hotword-Max-Duration
(VoiceGenie
extension)
|
If COM.VOICEGENIE.ASR.Recognition-Mode is set to hotword,
this specifies the maximum length (in ms) that input may be in order for
recognition to be performed. For example:
<property name="COM.VOICEGENIE.ASR.Hotword-Max-Duration" value=""2000""/>
If this property is set to 0, the OSR selective barge-in
mode will be enabled (i.e. no minimum and maximum duration constraints are
used, so COM.VOICEGENIE.ASR.Hotword-Min-Duration will be ignored).
Otherwise, the OSR magic word mode will be enabled (i.e. the minimum
and maximum duration constraints specified by COM.VOICEGENIE.ASR.Hotword-Min-Duration and COM.VOICEGENIE.ASR.Hotword-Max-Duration will be used).
|
|
|
COM.VOICEGENIE.ASR.Hotword-Confidence-Threshold
(VoiceGenie
extension)
|
If COM.VOICEGENIE.ASR.Recognition-Mode is set to hotword,
this specifies the speech recognition confidence level that should be used.
Values range from 0 (minimum confidence) to 1000 (maximum confidence).
Recognition results are rejected (a nomatch event is thrown) if
the confidence level of the results is below this threshold.
For this
property to take effect, you must also set the standard confidencelevel property to an equivalent decimal
percentage. For example:
<property name="COM.VOICEGENIE.ASR.Hotword-Confidence-Threshold" value=""100""/> <property name="confidencelevel" value="0.1"/> |
|
|
Property
|
Description
|
Default
Value
|
|
audiofetchhint
|
Defines when
audio files can be fetched:
- prefetch - audio file may be
downloaded when the page is loaded
- safe - only load the audio
file when needed
- stream - allows audio
streaming with HTTP.
|
prefetch
|
|
audiomaxage
|
Defines
maximum acceptable age, in seconds, of cached audio resources.
|
undefined
|
|
audiomaxstale
|
Defines
maximum staleness, in seconds, of expired cached audio resources.
|
undefined
|
|
documentfetchhint
|
Defines when
next document can be fetched:
- safe - only load the next
document when needed
|
safe
|
|
documentmaxage
|
Defines
maximum acceptable age, in seconds, of cached documents.
|
undefined
|
|
documentmaxstale
|
Defines
maximum staleness, in seconds, of expired cached documents.
|
undefined
|
|
grammarfetchhint
|
Defines when
grammar files can be fetched:
- prefetch - grammar file may
be downloaded when the page is loaded
- safe - only load the grammar
file when needed
This is not
supported with SpeechWorks OSR.
|
prefetch
|
|
grammarmaxage
|
Defines
maximum acceptable age, in seconds, of cached grammar resources.
SpeechWorks
OSR 1.x does not support this. If grammarmaxage is specified, an
appropriate value for caching will be passed to the
OSR engine instead.
|
undefined
|
|
grammarmaxstale
|
Defines
maximum staleness, in seconds, of expired cached grammar resources.
SpeechWorks
OSR 1.x does not support this. If grammarmaxstale is specified, an
appropriate value for caching will be passed to the
ASR engine instead.
|
undefined
|
|
objectfetchhint
|
Defines when
objects can be fetched:
- prefetch - object may be
downloaded when the page is loaded
- safe - only load the object
when needed
|
prefetch
|
|
objectmaxage
|
Defines
maximum acceptable age, in seconds, of cached object resources.
|
undefined
|
|
objectmaxstale
|
Defines
maximum staleness, in seconds, of expired cached object resources.
|
undefined
|
|
scriptfetchhint
|
Defines when
scripts can be fetched:
- prefetch - script may be
downloaded when the page is loaded
- safe - only load the script
when needed
|
prefetch
|
|
scriptmaxage
|
Defines
maximum acceptable age, in seconds, of cached script resources.
|
undefined
|
|
scriptmaxstale
|
Defines
maximum staleness, in seconds, of expired cached script resources.
|
undefined
|
|
fetchaudio
|
The URI of
audio to play while waiting for documents to be fetched.
|
builtin:background_audio.wav
|
|
fetchaudiodelay
|
The length of
time to wait at the start of a fetch delay before playing fetchaudio.
|
1s
|
|
fetchaudiominimum
|
The minimum
length of time to play fetchaudio, once started, even
if the fetch result arrives in the meantime.
|
0s
|
|
fetchtimeout
|
Timeout for
fetches.
The
fetchtimeout property setting in the platform defaults file will be used when
fetching:
- root documents
- the initial document of a
call
- the initial document used by
a forked instance
- any pages to which the
platform is redirected (with an HTTP 3xx response code)
An error.badfetch is thrown when a
fetch duration exceeds fetchtimeout.
|
30s
|
The Audio Control Feature is an extension to VoiceXML.
|
Property
|
Description
|
Default
Value
|
|
com.voicegenie.noaudiocontrol
(extension)
|
If this
property is set (to any value), the com.voicegenie.audiocontrol property is disabled.
|
undefined
|
|
com.voicegenie.audiocontrol
(extension)
|
(Only used if
com.voicegenie.noaudiocontrol is undefined.) Set to
true to enable Audio Control during playing of audio. Set to false to disable
the feature.
|
true
|
|
com.voicegenie.audio.skipduration
(extension)
|
Sets the
duration of audio to be skipped when using the skipahead/skipback features.
- The default unit is
milliseconds.
|
6000ms
|
|
com.voicegenie.audio.skipahead
(extension)
|
Sets the DTMF
button for skipping ahead in the audio file/TTS. The duration skipped depends
on the value of the com.voicegenie.audio.skipduration property. If set to
"-" or undefined, this feature is disabled.
|
undefined
|
|
com.voicegenie.audio.skipback
(extension)
|
Sets the DTMF
button for rewinding the audio file/TTS. The duration rewound depends on the
value of the com.voicegenie.audio.skipduration property. If set to
"-" or undefined, this feature is disabled.
|
undefined
|
|
com.voicegenie.audio.louder
(extension)
|
Sets the DTMF
button for turning volume up. If set to "-" or undefined, this
feature is disabled.
|
undefined
|
|
com.voicegenie.audio.softer
(extension)
|
Sets the DTMF
button for turning volume down. If set to "-" or undefined, this
feature is disabled.
|
undefined
|
|
com.voicegenie.audio.pause
(extension)
|
Sets the DTMF
button for pausing playback temporarily, until the pause button is pressed a
second time. If set to "-" or undefined, this feature is disabled.
|
undefined
|
|
com.voicegenie.audio.stop
(extension)
|
Sets the DTMF
button for stopping all queued audio playback. If set to "-" or
undefined, this feature is disabled.
|
undefined
|
|
com.voicegenie.audio.next
(extension)
|
Sets the DTMF
button for interrupting the current audio playback, and starting the next
audio playback in the queue. If set to "-" or undefined, this
feature is disabled.
|
undefined
|
|
com.voicegenie.audio.faster
(extension)
|
Sets the DTMF
button for increasing the rate of audio playback. If set to "-" or
undefined, this feature is disabled.
The IP Media
Server does not currently support this property.
|
undefined
|
|
com.voicegenie.audio.slower
(extension)
|
Sets the DTMF
button for decreasing the rate of audio playback. If set to "-" or
undefined, this feature is disabled.
The IP Media
Server does not currently support this property.
|
undefined
|
|
vgaudiocontrol
(extension)
|
Deprecated.
Use com.voicegenie.audiocontrol instead.
|
true
|
|
vgaudioskipahead
(extension)
|
Deprecated.
Use com.voicegenie.audio.skipahead instead.
|
undefined
|
|
vgaudioskipback
(extension)
|
Deprecated.
Use com.voicegenie.audio.skipback instead.
|
undefined
|
|
vgaudiolouder
(extension)
|
Deprecated.
Use com.voicegenie.audio.louder instead.
|
undefined
|
|
vgaudiosofter
(extension)
|
Deprecated.
Use com.voicegenie.audio.softer instead.
|
undefined
|
|
vgaudiopause
(extension)
|
Deprecated.
Use com.voicegenie.audio.pause instead.
|
undefined
|
|
vgaudiostop
(extension)
|
Deprecated.
Use com.voicegenie.audio.stop instead.
|
undefined
|
|
Property
|
Description
|
Default
Value
|
|
loglevel
(extension)
|
Limits
execution of <log> elements to the ones
whose level attribute have a
value up to (including) the loglevel value.
This
property can only be defined in the document scope or higher (i.e. as an
immediate child of <vxml>).
|
1
|
|
metricslevel
(extension)
|
Controls the
amount of detail logged to the metrics file (pw_metricsfile) on the platform. Here's the general
type of metrics information at each level:
- 0 - inbound/outbound call
states, and
<log> content (see note below)
- 1 - level 0 detail + page
compilation and application name
- 2 - level 1 detail +
application end, prompt ends, and errors
- 3 - level 2 detail + document
fetching, application traversal/states/events, prompts, and warnings
- 4 - level 3 detail + resource
fetching (other than VoiceXML pages)
- 5 - level 4 detail +
variable/script/expression evaluation
Note that if <log>s are executed (which depends on the loglevel), their content is only written to
the metrics file if specified by their dest attribute.
This
property can only be defined in the document scope or higher (i.e. as an
immediate child of <vxml>).
|
1
|
|
com.voicegenie.disablerecord
(extension)
|
If this
property is set (to any value), the dest attribute of the <record> element is disabled. This property
can only be defined in the platform defaults file.
|
undefined
|
|
com.voicegenie.maxeventcount
(extension)
|
Used to
detect an infinitely looping event (to limit platform resource usage if a
phone is left off the hook while an application is running). This property
should be set to an integer value, to define the maximum count for any one
event counter. Once the maximum is exceeded, the call will end. If undefined,
there is no limit on the event counters.
|
200
|
|
com.voicegenie.xmlencoding
(extension)
|
An integer
bit field to turn on/off encoding of various types of content before passing
it to the ASR/TTS engines. This property can only be defined in the
document scope or higher (i.e. as an immediate child of <vxml>).
- bit0 - Set to 1 to turn on
encoding of SSML attribute values (or 0 to turn off).
- bit1 - Set to 1 to turn on
encoding of SSML PCDATA (or 0 to turn off).
- bit2 - Set to 1 to turn on
encoding of XML grammar attribute values (or 0 to turn off).
- bit3 - Set to 1 to turn on
encoding of XML grammar PCDATA (or 0 to turn off).
To use this
property, take the desired setting for each of the 4 bits above (use 1 for
any, if unsure), and put them together to get the 4-digit binary number <bit3><bit2><bit1><bit0>.
Convert that to a decimal number and then to a hexadecimal number <hex#>.
Finally, set the property value to "0x<hex#>".
For example,
to encode SSML attributes, SSML data, and XML grammar data, but not XML
grammar attributes, the binary number is 1011, which is decimal 11, and
hexadecimal b. So the property value should be "0xb".
(Note that
the default is "0xf". That is because the default for each bit is
1, so the binary default is 1111, which is decimal 15, and hexadecimal f.)
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0xf
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com.voicegenie.useconnectionevent
(extension)
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Set to true
to specify that the IP Media Server should throw *connection* events, where applicable. Set to false
to specify that the platform should throw *telephone* events, instead. See Call-Related Events, for details. This
property can only be defined in the document scope or higher (i.e., as an
immediate child of <vxml>).
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platform-specific
|
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com.voicegenie.strictconformance
(extension)
|
Set to true
to specify that the interpreter should conform strictly to the VoiceXML 2.0
specification in certain scenarios, requiring a set of behaviour changes from
previous versions. Set to false to choose not to make the set of changes.
This property can be configured through the Media Server > VXML menu in
the Dialogic(r) IP Media Server Web User Interface. See Strict Conformance for
details.
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platform-specific
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The following properties are specific to the IP Media Server platform. The
first three are useful for debugging purposes.