/**
* Controls how JSON structure for the Tropo object is rendered.
*
* @return string
* @access private
*/
public function __toString()
{
// Remove voice and language so they do not appear in the rednered JSON.
unset($this->_voice);
unset($this->_language);
// Call the unescapeJSON() method in the parent class.
return parent::unescapeJSON(json_encode($this));
}
