<p>already set multi_notify modparam.</p>
<p>In four nodes case, ka.ns.com is not resolve to four ip at once.<br>
ka.ns.com resolve to ip1 in first visit, and resolve to ip2 in second visit, and so on.<br>
This is DNS action. not kamailio.<br>
Maybe it is not a general usage, DNS should resolve to all four ip.</p>
<p>I realized my problem,  DNS should resolve to all four ip.<br>
Thanks.</p>

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