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    <p>Perfect...</p>
    <p>so why in the Tutorial de INVITE comes from Main Registrar?</p>
    <pre class="escaped">   # initial requests from main registrar, need to look them up!
    if (is_method("INVITE|MESSAGE") && $si == "10.0.0.3" && $sp == 5070) {
        xlog("looking up $ru!\n");
        if (!mid_registrar_lookup("location")) {
            t_reply("404", "Not Found");
            exit;
        }

        t_relay();

        exit;
    }

The INVITE from user go trough the mid_registrar to main registrar and then came back to mid_registrar to called user...
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    <pre class="moz-signature" cols="72">---
I'm SoCIaL, MayBe</pre>
    <div class="moz-cite-prefix">El 27/01/2020 a las 08:35, Alexey
      Kazantsev via Users escribió:<br>
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      <div>It is absolutely correct.</div>
      <div>And that’s your job, as a VoIP adminitsrator, to forward this
        INVITE</div>
      <div>to the appropriate server.</div>
      <div> </div>
      <div>Any SIP client will send INVITE to the server defined in its
        settings,</div>
      <div>at least if something additional is not configured («Outbound
        proxy»</div>
      <div>or «Route» or maybe it’s called something else, depending on
        the vendor/software author).</div>
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            <div>-----------------------------------------------<br>
              <span style="font-size: 15px;">BR, Alexey</span><br
                style="font-size: 15px;">
              <span style="font-size: 15px;"><a class="moz-txt-link-freetext" href="http://alexeyka.zantsev.com/">http://alexeyka.zantsev.com/</a></span></div>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
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