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    Ah - nm, i see it in an sl callback<br>
    <br>
    <pre>Mar 17 22:19:01 sip2 /usr/local/opensips-2-head/sbin/opensips[31285]: DBG:sl:sl_reply_error: error text is Server error occurred (1/SL)

... so are you doing anything statless in your config?  This looks like it might be siptrace related.
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    <div class="moz-cite-prefix">On 03/17/2015 11:11 AM, Eric Tamme
      wrote:<br>
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    <blockquote cite="mid:55086047.6020406@uphreak.com" type="cite">
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      I do not see the 500 from opensips in this log.<br>
      <br>
      <div class="moz-cite-prefix">On 03/17/2015 11:07 AM, Satish Patel
        wrote:<br>
      </div>
      <blockquote
cite="mid:CAPgF-fo82+fk+tG83k8BcV99EzPTN-PNArRWTcYcUAKRKd-BVQ@mail.gmail.com"
        type="cite">
        <div dir="ltr">Here is the debug 4 logs  <a
            moz-do-not-send="true" href="http://pastebin.com/CdPxFrNp">http://pastebin.com/CdPxFrNp</a>
          <div><br>
          </div>
          <div>173.48.111.111  - UA <br>
          </div>
          <div>188.79.242.164  - OpenSIPs<br>
          </div>
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        <div class="gmail_extra"><br>
          <div class="gmail_quote">On Tue, Mar 17, 2015 at 12:45 PM,
            Eric Tamme <span dir="ltr">&lt;<a moz-do-not-send="true"
                href="mailto:eric@uphreak.com" target="_blank">eric@uphreak.com</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">This is
              a ladder diagram, not a sip trace.  A ladder diagram is
              not useful in this case.<br>
              <br>
              Turn your debug up to 4, capture the log of the
              register/500 happening and submit a link to the pastebin. 
              DO NOT paste the contents into an email.
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