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| Event | Description |
| cancel | User input matched the built-in cancel grammar. |
| error.badfetch | A resource is required but the browser was unable to fetch it from the specified URL. |
| error.badfetch.http.nnn | HTTP error nnn occurred, for example, 404 for Page Not Found. |
| error.noauthorization | "Access denied" error, user has tried to do something without sufficient permission. |
| error.semantic | A semantic error was found in the VoiceXML page, for example an undefined variable was referenced, divide by zero, root document <vxml> tag has an application attribute, etc. |
| error.unsupported.format | Browser does not support the resource format, e.g. sound file type, grammar type etc. |
| error.unsupported.tag | The browser does not support the given tag. E.g., if the browser does not support <subdialog>, it would throw error.unsupported.subdialog. |
| exit | User input matched the built-in exit grammar. |
| help | User input matched the built-in help grammar. |
| noinput | No user input was expected but none was detected. |
| nomatch | User input did not match the grammar for the current form or field. |
| telephone.disconnect.hangup | The user hung up or a <disconnect> was executed. |
| telephone.disconnect.transfer | The browser hung up as a result of an unconditional transfer. |
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