<p>Present in OpenSIPS 1.9+. This should work:</p>
<pre><code>route [foo]
{
if (not $param(1)) {
...
}
}
route(foo, NULL, $var(bar));
</code></pre>
<p>Currently, you can hack it to make it work like this:</p>
<pre><code>$var(nullvar) = NULL;
route(foo, $var(nullvar), $var(bar));
</code></pre>
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