What about open sip stack:<br><br><a href="http://www.opensipstack.org/">http://www.opensipstack.org/</a><br><br>?<br><br><div><span class="gmail_quote"><br></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>Use a far end nat traversal appliance. Acmepacket , kagoor and Jasomi<br>are some examples.<br><br>Leo<br><br></blockquote></div><br>