According to the wiki (and page 251 of the FS book, which has this exact same example) you need something like this:<div><br></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><pre>&lt;action application=&quot;bridge&quot; data=&quot;{enable_heartbeat_events=5,nibble_rate=1,nibble_account=0838833133}sofia/external/$<a href="mailto:1@tel.co.th">1@tel.co.th</a>&quot;/&gt;</pre>
</div><div>The link is <a href="http://wiki.freeswitch.org/wiki/Mod_nibblebill#Bill_base_on_B_leg_Only">http://wiki.freeswitch.org/wiki/Mod_nibblebill#Bill_base_on_B_leg_Only</a></div><div><br></div><div>In your example I don&#39;t know that you necessarily have a b-leg. How are you getting the call to the conference? Do you use originate? Or is it an inbound call?</div>
<div>-MC<br><br><div class="gmail_quote">On Mon, Jan 3, 2011 at 11:30 AM, Madovsky <span dir="ltr">&lt;<a href="mailto:infos@madovsky.org">infos@madovsky.org</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">






<div bgcolor="#ffffff">
<div><font size="2">in mod_nibblebill wiki page</font></div>
<ul>
  <li>Q: Can you bill based on a multi-call B-Leg, where you have, say a 
  conference call with multiple people on it? 
  <ul>
    <li>Yes, see answer above re: B-Leg and not A-Leg. </li></ul></li></ul>
<div><font size="2">but if I have this in my dialplan</font></div>
<div><font size="2"></font> </div>
<div><font size="2">    &lt;extension 
name=&quot;conference&quot;&gt;<br>        
&lt;condition field=&quot;destination_number&quot; 
expression=&quot;^conference$&quot;&gt;<br>                
&lt;action application=&quot;export&quot; 
data=&quot;nolocal:nibble_account=${dest_nibble_account}&quot;/&gt;<br>                
&lt;action application=&quot;export&quot; 
data=&quot;nolocal:nibble_rate=0.03&quot;/&gt;<br>                
&lt;action application=&quot;sleep&quot; 
data=&quot;3000&quot;/&gt;<br>                
&lt;action 
application=&quot;answer&quot;/&gt;<br>                
&lt;!-- &lt;action application=&quot;speak&quot; data=&quot;cepstral|cepstral|connecting your 
call to the conference&quot;/&gt; 
--&gt;<br>                
&lt;action application=&quot;conference&quot; data=&quot;<a href="mailto:$%7Bdest_nibble_account%7D-$$%7Bdomain%7D@default+$%7Bdest_conf_pin%7D%22/" target="_blank">${dest_nibble_account}-$${domain}@default+${dest_conf_pin}&quot;/</a>&gt;<br>
        
&lt;/condition&gt;<br>    &lt;/extension&gt;</font></div>
<div><font size="2"></font> </div>
<div><font size="2">it doesn&#39;t work</font></div><div><div></div><div class="h5">
<div><font size="2"> </font></div>
<div><br></div>
<blockquote style="border-left:#000000 2px solid;padding-left:5px;padding-right:0px;margin-left:5px;margin-right:0px" dir="ltr">
  <div style="font:10pt arial">----- Original Message ----- </div>
  <div style="font:10pt arial;background:#e4e4e4"><b>From:</b> 
  <a title="infos@madovsky.org" href="mailto:infos@madovsky.org" target="_blank">Madovsky</a> 
  </div>
  <div style="font:10pt arial"><b>To:</b> <a title="freeswitch-users@lists.freeswitch.org" href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.freeswitch.org</a> 
  </div>
  <div style="font:10pt arial"><b>Sent:</b> Monday, January 03, 2011 2:21 
  PM</div>
  <div style="font:10pt arial"><b>Subject:</b> mode_nibblebill and 
  mod_conference</div>
  <div><br></div>
  <div><font size="2">Is nibblebill works with conference ?</font></div>
  <div><font size="2">I tried to set nibble_account and nibble_rate without 
  success</font></div>
  <div><font size="2"></font> </div>
  <div><font size="2">Thanks</font></div></blockquote></div></div></div>
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<br></blockquote></div><br></div>