add min record len to voicemail

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7077 d0543943-73ff-0310-b7d9-9358b9ac24b2

conf/autoload_configs/voicemail.conf.xml

@@ -7,6 +7,7 @@
       <param name="terminator-key" value="#"/>
       <param name="max-login-attempts" value="3"/>
       <param name="digit-timeout" value="10000"/>
+      <param name="min-record-len" value="3"/>
       <param name="max-record-len" value="300"/>
       <param name="tone-spec" value="%(1000, 0, 640)"/>
       <param name="callback-dialplan" value="XML"/>