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developer_guide:voicexml_references:elements:audio ...
https://wiki.voximal.com/doku.php?id=developer_guide:voicexml_references:elements:audio
Expr is an ECMAScript expression for the URI of the audio file. If the src attribute is specified, it takes precedence over this attribute. If <audio> contains this attribute that evaluates to null, this element will be skipped, including its alternate content. Either …
audio element - studio.tellme.com
https://studio.tellme.com/vxml2/ref/elements/audio.html
The audio element plays back a pre-recorded audio file or text that's synthesized using a Text-To-Speech (TTS) engine. If the src or expr attribute points to a valid audio file, any text specified within the audio element is ignored. If the audio file cannot be retrieved, the specified text is synthesized and played to the user.
VoiceXML prompts - 35.168.182.232
http://35.168.182.232/Content/nss_dev/nssdev_vxml_prompts.html
To request full audio retrieval prior to playback, use the "prefetch" fetchhint. The following example illustrates a basic VoiceXML prompt and the corresponding MRCP SPEAK request. Note that the example includes several different audio modes: Audio file, with TTS text as backup (welcome) Audio file (thrush call) TTS; Say-as TTS ($299.95)
VoiceXML::Client: Supported VoiceXML Elements- …
http://voicexml.psychogenic.com/voicexmlElements.php
<audio expr="myfilevariable" /> src. A literal string pointing to an audio file of a format usable by your telephony device. ... forms contain items to be filled and actions to perform once those fields have been filled. A VoiceXML page may contain many form items, and they will normally be entered in page order, ...
VoiceXML Forum - Certification Test Report - Envox
https://voicexml.org/sites/default/files/platform_certification/envox/envox_ctr.html
The interpreter evaluates, fetches, and plays the URI associated with the expr attribute of the audio element. 372: If expr is set to ECMAScript undefined the audio element is ignored. 373 If the URI associated with src is unavailable, the interpreter renders the content contained by the audio element. ... VoiceXML variables and ECMAScript ...
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