小弟遇到个问题，劳驾各高手解答。
在解析VXML时，当出现输入域时，解析器不能停止下来让我输入。。。直接运行到最后而结束。
小弟愚昧。。请高手指点。
<?xml version="1.0"?>
<vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
 <form id="credit_card_info">
  <block>We now need your credit card type, number, and expiration date.</block>
  <field name="card_type">
   <prompt>
    What kind of credit card do you have?
    1 visa 2 master
   </prompt>
   <grammar mode="dtmf" root="item1">
                  <rule id="item1">
                    <one-of>
                       <item>1</item>
                       <item>2</item>
                    </one-of>
                  </rule>
            </grammar>
    <catch event="noinput">
    Byebye!
    <disconnect/>
   </catch>

  </field>

  <filled>
           <if cond="card_type == 1">
               Your card_type is visa.      
           <elseif cond="card_type == 2"/>
               Your card_type are master .
           </if>
        </filled>
 </form>
</vxml>

拿这个VXML来说。。。解析器，没暂停让我输入。而直接catch noinput而挂断了。