Receiving Digit String Input

You can use built-in “digits” grammar to accept digit strings such as credit card account information. You use the type attribute in a <field> element to select the built-in grammar.

Example Receiving Digit String Input shows how to receive DTMF input for a credit card account number.

<form>
   <field name="creditNumber" type="digits">
   Please enter your credit card number.
   Press the pound key when finished.
     <filled>
       Your credit card number is
       <value expr="creditNumber" class="digits" mode="recorded"/>
       <exit namelist="creditNumber"/>
     </filled>
     </field>
</form>