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<h2><a href="https://wiki.asterisk.org/wiki/display/AST/Calling+using+Google?focusedCommentId=18415671#comment-18415671">Calling using Google</a></h2>
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<b>comment added</b> by <a href="https://wiki.asterisk.org/wiki/display/~utah_dave">David Boucha</a>
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<p>I had a similar symptom. I could dial call my Google Voice number one time successfully, and then nothing would come through after that.</p>
<p>I found that if I were logged out of Gmail and Google Talk, then I could successfully call my Google Voice number and have it work each time.</p>
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<strong>In reply to a comment by <a href="/wiki/display/~lakesidetech@hotmail.com"
class="url fn confluence-userlink" data-username="lakesidetech@hotmail.com"
>Lakeside Tech</a>:</strong><br/>
<p>I just had time to take a look at the problem. It looks like a problem with RTP behind NAT through STUN.</p>
<p>One problem I notice with NAT support in chan_gtalk is, it sends private IP as the first RTP candidate and then sends the external ip as second candidate. This can be reproed with setting stunaddr=x.x.x.x in gtalk.conf. </p>
<p>The private IP should not be sent as candidate. That seems a bug to me. I just modified the code and compiled asterisk with my own chan_gtalk.</p>
<p>Now back to the incoming call problem with behind NAT asterisk server. Setting externip or stunaddr made it work exactly ONCE, then all following calls fail. It looks some state keeping on gtalk server is messed up after one call. Strange.</p>
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