Description
The <voice> tag specifies attributes of the synthesized voice.
If an attribute is not specified, the value remains as it was previously set, it is not reset to a default. The new values apply to all the text enclosed within the tag (unless overridden by a nested <voice> tag) and then reverts to the previous values when the end tag is reached.
VoiceXML browsers are not obligated to fully implement all speech markup tags, however, a compliant browser must silently ignore any tags it does not support, and should make its best efforts to map any unimplemented mark-up to something similar that is supported.