<div dir="ltr">Yes it is possible however, you need the two servers to listen on different<div style>SIP signalling ports (eg, OpenSIPS -&gt; 5060, Asterisk 5080).</div><div style><br></div><div style>Please read <a href="https://www.google.ca/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=2&amp;cad=rja&amp;uact=8&amp;ved=0CCYQFjAB&amp;url=http%3A%2F%2Fwww.voip-sip.org%2Fwp-content%2Fuploads%2F2011%2F08%2FBuilding-Telephony-Systems-with-OpenSIPS-1.6.pdf&amp;ei=S5bHVMayKYaWgwS25oOIDg&amp;usg=AFQjCNHMWurqP1U8hpwN1ctrTV1jcq1n5g&amp;sig2=UE-wunYIgC_MkrXhyeaQmg&amp;bvm=bv.84349003,d.eXY" style="font-size:18px;white-space:nowrap;color:rgb(102,0,153)">Building Telephony Systems with OpenSIPS 1.6</a>.</div><div style>It&#39;s available free online, will take you a few days to maybe</div><div style>2 weeks to go through and implement (depending on proficiency)</div><div style>however, well worth the time in my opinion.</div><div style><br></div><div style>There is also <a href="http://www.opensips.org/Documentation/Tutorials-OpenSIPSAsteriskIntegration">http://www.opensips.org/Documentation/Tutorials-OpenSIPSAsteriskIntegration</a></div><div style><br></div><div style>Thank you come again,</div><div style><br></div><div style>Nick.</div></div>