Following is the list of events that are supported by the VoiceXML Browser:
The user has asked to exit. This is available when the universals property includes exit.
The user has asked for help. This is available when the universals property includes help.
The user has not responded within the timeout interval.
The user inputs something, but it was not recognized.
The user input was too long, exceeding the property value (not supported for speech recognition).
The caller hangs up.
The call was “blind transferred” to another line and will not return.