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    <p><font size="-1">I think I have got to the bottom of this.  There
        was also an options ping going on and the 500 internal server
        error was generated if the options ping arrived before the ack
        for the 200 ok response to the invite ping.</font><br>
    </p>
    <div class="moz-signature"><font size="-1"><font face="Verdana">Kind
          regards,<br>
          <br>
          Adrian Fretwell<br>
        </font></font><small><small><small><font face="Verdana"><br>
            </font></small></small></small>
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    <div class="moz-cite-prefix">On 12/08/16 06:08, Johan De Clercq
      wrote:<br>
    </div>
    <blockquote
cite="mid:5AB35FAD44B8F4E0.0F182BD8-D935-4049-868C-930636D42977@mail.outlook.com"
      type="cite">
      <div>Do you have a tracé ?<br>
        <br>
        <div class="acompli_signature">Get <a moz-do-not-send="true"
            href="https://aka.ms/o0ukef">Outlook for iOS</a></div>
        <br>
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      <br>
      <br>
      <br>
      <div class="gmail_quote">On Thu, Aug 11, 2016 at 9:58 PM +0200,
        "Adrian Fretwell" <span dir="ltr">&lt;<a moz-do-not-send="true"
            href="mailto:adrian.fretwell@topgreen.co.uk" target="_blank">adrian.fretwell@topgreen.co.uk</a>&gt;</span>
        wrote:<br>
        <br>
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          .8ex;border-left:1px #ccc solid;padding-left:1ex">
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            <p><font size="-1">I wonder if any Opensips experts and shed
                any light on this.</font></p>
            <p><font size="-1">I have just upgraded to Opensips 2.2.1 to
                take advantage of the new dialog reinvite ping, but what
                I am seeing is every time my Opensips proxy sends an
                invite ping the UAC (tried polycom and Yealink phones)
                responds with a 500 Internal Server Error.  I can't see
                anything wrong with the invite packet that Opensips is
                sending out.  Any ideas how I can diagnose this further?</font><br>
            </p>
            <font size="-1"><font face="Verdana">Kind regards,</font></font><br>
            <div class="moz-signature"><font size="-1"><font
                  face="Verdana"><br>
                  Adrian Fretwell<br>
                </font></font> </div>
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      <pre wrap="">_______________________________________________
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</pre>
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