gistfile1.txt

say('Hello');
var result = ask('Begin entering a series of digits separated by the star key.', {choices: 'http://path-to/grammar.xml', terminator: '#', mode: 'dtmf', timeout: 5.0});
log('*** ' + result.value.replace(" ", "") + ' ***');

grammar.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<grammar xmlns="http://www.w3.org/2001/06/grammar" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.w3.org/2001/06/grammar http://www.w3.org/TR/speech-grammar/grammar.xsd"
	version="1.0" xml:lang="en-US" root="main">

	<rule id="main" scope="public">
		<item repeat="1-">
			<one-of>
				<item>1</item>
				<item>2</item>
				<item>3</item>
				<item>4</item>
				<item>5</item>
				<item>6</item>
				<item>7</item>
				<item>8</item>
				<item>0</item>
				<item>*</item>
			</one-of>
		</item>
	</rule>

</grammar>