VXML record processing dtmf termchar

Question

I am having trouble processing a dtmf within a record tag.

I am looking to identify the zero entered during recording and perform specific action based on the value. zero could be entered anytime before or after speaking.

With the following snippet I see that when I enter zero, the application exits. It looks like the block tag is reached, but then processing terminates. I am not sure what the problem is here. Or is there a better way to acheive the same?

I also referred the answer here: VoiceXML - Recognize DTMF in Recording, but need more details.

<form id="recordMessage">
<property name="termchar" value="" />
<property name="inputmodes" value="dtmf" />

<var name="lastdtmfchar" expr="1"/>

<record name="recording"  beep="true" maxtime="120s"  dtmfterm="false" type="audio/wav">
  <grammar mode="dtmf" version="1.0" root="dtmfSettings" xmlns="http://www.w3.org/2001/06/grammar">
     <rule id="dtmfSettings" >
        <one-of>
           <item>0</item>
           <item>#</item>               
        </one-of>
     </rule>
  </grammar>
    <filled>
    <assign name="lastdtmfchar" expr="recording$.termchar"/>        
    <if cond = "recording$.termchar == '#'">
    <prompt> Hash entered
    </prompt>           
    </if>
    <if cond = "recording$.termchar == '0'">
        <prompt> zero entered
    </prompt>
    </if>
    </filled>       
</record>   
<block>
    <if cond = "lastdtmfchar == '1'">   
    <prompt>  block value not assigned
    </prompt>
    </if>   
    <if cond = "lastdtmfchar == '#'">
        <prompt> block hash entered
    </prompt>           
    </if>
    <if cond = "lastdtmfchar == '0'">
        <prompt> block zero entered
    </prompt>
            </if>
</block> 

There is only this record tag in the form, but the root doc has all the handlers..

<vxml .....>
<catch event="connection.disconnect.hangup">
    <goto next="${hangupUrl}?cause=hangup" />
</catch>
<catch event="connection.disconnect">
    <goto next="${hangupUrl}?cause=disconnect" />
</catch>
<catch event="error">
    <prompt>
        <audio src="${goodbyeUrl">
        </audio>
    </prompt>
    <exit/>
</catch>
<catch event="*">
    <prompt>
        <audio src="${goodbyeUrl">
        </audio>
    </prompt>
    <exit/>
</catch>
<property name="termchar" value="#"/>
<link dtmf="0" next="${globalHandlerUrl}">  
</link>
</vxml>

Answer 1

As you mentioned, dtmfterm = false may be the reason. You can get the grammar matched character by accessing application.lastresult$. Refer http://www.w3.org/TR/voicexml20/#dml2.3.6 Agree with @kevin that in IVRs, a lot of things depend on the vendor itself (using a grammar in record is itself optional in the spec)