<extension name="user_voicemail">
<condition>
    <action application="info"/>
    <action application="log" data="${sip_h_X-Call-Type}"/>
    <action application="log" data="${X-Call-Type}"/>
</condition>
    <condition field="${sip_h_X-Call-Type}" expression="^User-VM$">
        <action application="answer"/>
...
and see out, with /log debug
in info - check variable

On 05.11.2015 13:50, sunil more wrote:

<extension name="user_voicemail">
    <condition field="${sip_h_X-Call-Type}" expression="^User-VM$">
        <action application="answer"/>