<p></p>
<p>You can see</p>
<pre><code>REGISTER sip:voip.domain.com SIP/2.0.
Via: SIP/2.0/UDP 32.1.128.4:45417;rport;branch=z9hG4bKPjZ5fpsipsncRX35bosd-juQhhswwf2n.t.
Max-Forwards: 70.
From: <sip:83@voip.domain.com>;tag=zMJ4EsFF8lnLBuDCWxk52XJgy84zU180.
To: <sip:83@voip.domain.com>.
Call-ID: qlKuZzPgK8dIzwwwpRRsP8yNr3xpWzzE.
CSeq: 54489 REGISTER.
User-Agent: ABTO VoIP SDK.
</code></pre>
<p>These messages send not by <code>Kamailio</code>.<br>
This message send by "ABTO VoIP SDK".</p>
<p>You need to check "ABTO VoIP SDK" provider to config manage difference with IPv6/IPv4 address when used TCP/UDP transport.</p>

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