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    You are missing the left curly brace after your if statment.... im
    suprised your script runs at all<br>
    <br>
    <div class="moz-cite-prefix">On 03/17/2015 11:48 AM, Satish Patel
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAPgF-fr2qw-66o619Ve8QgST1uZ1htTLQHiY6Pnwwy1Me6eMPw@mail.gmail.com"
      type="cite">
      <div dir="ltr">Eric,
        <div><br>
        </div>
        <div>I found what was the issue, I sent you REGISTER method
          snippet before, if you look at it, If remove/comment out
          "sl_reply_error();"  line in following code, it stopped
          sending 500 Error. Very interesting..  Do you think i need to
          put that in "curly braces" { } ?  </div>
        <div><br>
        </div>
        <div>
          <div> if (!save("location"))</div>
          <div>                        xlog("L_ERR", "Saving contact
            failed - M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");</div>
          <div>                        sl_reply_error();</div>
          <div><br>
          </div>
          <div>                exit;</div>
          <div>        }</div>
        </div>
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Tue, Mar 17, 2015 at 1:27 PM, Satish
          Patel <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:satish.txt@gmail.com" target="_blank">satish.txt@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">
            <div dir="ltr">Even after disabled "siptrace" it is
              happening. no luck :(</div>
            <div class="HOEnZb">
              <div class="h5">
                <div class="gmail_extra"><br>
                  <div class="gmail_quote">On Tue, Mar 17, 2015 at 1:20
                    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">
                      <div text="#000000" bgcolor="#FFFFFF"> Turn of
                        your sip tracing and see if the issue occurs. 
                        Its running some sl_callbacks (which i assume
                        are realated to siptrace).
                        <div>
                          <div><br>
                            <br>
                            <br>
                            <div>On 03/17/2015 11:19 AM, Satish Patel
                              wrote:<br>
                            </div>
                            <blockquote type="cite">
                              <div dir="ltr">I haven't done anything
                                related "stateless".  also in my config,
                                i haven't manually specify that 500
                                error anywhere where i can doubt.  I
                                don't know from where it is coming. must
                                be internally from opensips. </div>
                              <div class="gmail_extra"><br>
                                <div class="gmail_quote">On Tue, Mar 17,
                                  2015 at 1:14 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">
                                    <div text="#000000"
                                      bgcolor="#FFFFFF"> 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.
</pre>
                                      <div>
                                        <div> <br>
                                          <br>
                                          <div>On 03/17/2015 11:11 AM,
                                            Eric Tamme wrote:<br>
                                          </div>
                                          <blockquote type="cite"> I do
                                            not see the 500 from
                                            opensips in this log.<br>
                                            <br>
                                            <div>On 03/17/2015 11:07 AM,
                                              Satish Patel wrote:<br>
                                            </div>
                                            <blockquote type="cite">
                                              <div dir="ltr">Here is the
                                                debug 4 logs  <a
                                                  moz-do-not-send="true"
href="http://pastebin.com/CdPxFrNp" target="_blank">http://pastebin.com/CdPxFrNp</a>
                                                <div><br>
                                                </div>
                                                <div>173.48.111.111  -
                                                  UA <br>
                                                </div>
                                                <div>188.79.242.164  -
                                                  OpenSIPs<br>
                                                </div>
                                              </div>
                                              <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.
                                                    <div>
                                                      <div><br>
                                                        <br>
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