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    <div class="moz-cite-prefix">Hello Jimmy,<br>
      <br>
      Have you tried "sip_sticky_contact=true"?<br>
      (there's no documentation but here's the wiki page: <a
        class="moz-txt-link-freetext"
        href="http://wiki.freeswitch.org/wiki/NAT_Traversal#sip_sticky_contact">http://wiki.freeswitch.org/wiki/NAT_Traversal#sip_sticky_contact</a>)<br>
      I had kind of same issue as you and this solved my problem!<br>
      <br>
      Florent<br>
      <br>
      Le 18/04/2014 13:50, Jimmy Chang a &eacute;crit&nbsp;:<br>
    </div>
    <blockquote cite="mid:5351119A.7080101@gmail.com" type="cite">
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      <div class="moz-cite-prefix">Hi,<br>
        <br>
        I've tried NDLB-connectile-dysfunction, but to no avail.<br>
        SIP_Client1 and SIP_Client2 are all in the same 3G network, so I
        couldn't figure out why FS treated them in different ways.<br>
        <br>
        Thanks.<br>
        Jimmy<br>
        <br>
        &#26044; 2014/4/18 &#19979;&#21320; 04:55, Steven Ayre &#25552;&#21040;:<br>
      </div>
      <blockquote
cite="mid:CAFiqYunaxJ6PMja5-CmJaSfzZT8750V5kKt2VjEsRBz_JA3gPg@mail.gmail.com"
        type="cite">
        <div dir="ltr">BYE is sent to the address in the Contact header
          of the INVITE.
          <div><br>
          </div>
          <div>When a client is behind NAT that can mean the client
            gives an incorrect address (its internal not external IP
            which isn't reachable). In this case I assume there's some
            carrier NAT happening.</div>
          <div><br>
          </div>
          <div>If the client has STUN support that can work around it,
            or you can use one of the NDLB options -
            try&nbsp;NDLB-connectile-dysfunction</div>
        </div>
        <div class="gmail_extra"><br>
          <br>
          <div class="gmail_quote">On 18 April 2014 04:53, Jimmy Chang <span
              dir="ltr">&lt;<a moz-do-not-send="true"
                href="mailto:chang33.tw@gmail.com" target="_blank">chang33.tw@gmail.com</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
              <br>
              We have two different SIP Clients and they all use 3G to
              connect to FS.<br>
              SIP_Client1 receives BYE without problem but SIP_Client2
              couldn't.<br>
              In the SIP_Client2 case, I don't understand why FS sended
              BYE to<br>
              100.77.163.183 rather than 42.71.215.54.<br>
              Here are the snippet of FS log.<br>
              <br>
              <a moz-do-not-send="true"
                href="http://pastebin.freeswitch.org/22430"
                target="_blank">http://pastebin.freeswitch.org/22430</a><br>
              <br>
              Thanks.<br>
              Jimmy<br>
              <br>
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