<p>Yes, it is. The setup is the following:</p>
<pre><code>     +----------+                 +--------+
eth0 | Kamailio | eth1 <---> lan0 | Router | wan0
     +----------+                 +--------+

eth0 = 10.0.0.100
eth1 = 192.168.178.21
lan0 = 192.168.178.1
wan0 = public IP referenced by a DynDNS hostname in the advertise parameter
</code></pre>
<p>The via address is <code>192.168.178.21</code>.</p>

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