For the sake of posterity (and search engines) there's a workaround mentioned here:
http://wiki.freeswitch.org/wiki/Dingaling#How_do_I_send_DTMF_with_Googletalk.3F

-MC

On Wed, Oct 31, 2012 at 11:29 AM, Dmitry R <rdmitry0911@gmail.com> wrote:
Hi, does anybody know how to pass dtmf codes to an IVR behind the Google
Voice entrance number?
A simple example code from http://wiki.freeswitch.org/wiki/Google_Voice

  <extension name="google_in" continue="true">
     <condition field="caller_id_name" expression="^(Google Voice)$" >
         <action application="log" data="Google Voice Call Incoming" />
         <action application="set" data="execute_on_answer=send_dtmf 1"/>
     </condition>
   </extension>

doesn't work for me. DTMF codes can't get thru. Everything else other then
that works fine.

Any help would be very much appreciated, Dmitry


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