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    <tt>Hi Richard,</tt><tt><br>
    </tt><tt><br>
    </tt><tt>See rfc3261, chapter 6 </tt><tt>"Choosing the best
      response", Page 111 :</tt><br>
    <pre>          A proxy which receives a 503 (Service Unavailable) response
         SHOULD NOT forward it upstream unless it can determine that any
         subsequent requests it might proxy will also generate a 503.
         In other words, forwarding a 503 means that the proxy knows it
         cannot service any requests, not just the one for the Request-
         URI in the request which generated the 503.  If the only
         response that was received is a 503, the proxy SHOULD generate
         a 500 response and forward that upstream.</pre>
    <tt><br>
      Still, this gives you access (at script level) to the 503 reply
      (the change is done when sending it out), so you can investigate
      the Reason hdr (if present).<br>
      <br>
      And yes, we got your other email.<br>
      <br>
      Regards,<br>
    </tt>
    <pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
    <div class="moz-cite-prefix">On 06.01.2017 17:14, Richard Robson
      wrote:<br>
    </div>
    <blockquote
      cite="mid:285ee3fa-b1f7-e6ae-8729-6c8e5300cc10@greenlightcrm.com"
      type="cite">
      <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
      <div class="moz-cite-prefix">hmm,<br>
        <br>
        both our suppliers translate an unavailable number
        (Q.850;cause=41) as a 503. <br>
        <br>
        I Guess Im going to have to live with that.<br>
        <br>
        Did you see the other email this morning regarding opensips
        crashing?<br>
        I unhelpfully called theĀ  email opensipsp<br>
        <br>
        <br>
        <br>
        On 06/01/2017 14:41, Bogdan-Andrei Iancu wrote:<br>
      </div>
      <blockquote
        cite="mid:6aa39dec-1b17-9eeb-40b8-e7b46f9fabe3@opensips.org"
        type="cite">
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        <tt>Hi Richard,<br>
          <br>
          Any incoming 503 reply is converted by OpenSIPS to a 500 reply
          (as per RFC3261).<br>
          <br>
          Regards,<br>
        </tt>
        <pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
        <div class="moz-cite-prefix">On 06.01.2017 16:22, Richard Robson
          wrote:<br>
        </div>
        <blockquote
          cite="mid:736252ef-2076-e207-2119-0129158f163d@greenlightcrm.com"
          type="cite">
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          <p>Hi,</p>
          <p><br>
          </p>
          <p>we are getting 503 messages back but when this is stored on
            Homer as a 500. I'm not sure if its Opensips's sipcapture
            module or Homer doing the translation</p>
          <p><br>
          </p>
          <p>This is the packet captured in sngrep in the sip box</p>
          <p>2017/01/06 14:13:59.210301 141.170.24.20:5060 ->
            192.168.36.141:5060<br>
            SIP/2.0 503 Service Unavailable<br>
            Via: SIP/2.0/UDP
            141.170.9.156:5060;branch=z9hG4bKd116.a30f9976.0<br>
            From: <a moz-do-not-send="true"
              class="moz-txt-link-rfc2396E"
              href="sip:442035420637@192.168.36.68"><sip:442035420637@192.168.36.68></a>;tag=as55dfe54a<br>
            To: <a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
              href="sip:+447910705624@141.170.24.20"><sip:+447910705624@141.170.24.20></a>;tag=gK00d54f0d<br>
            Call-ID:
DLGCH_e0lXV2Z/MWR7SFYIMHFjZ3oSAwoyL2YwfkdXX2F5YGsPQVxcfXhma2FDU0BlcWpmf0ZV<br>
            CSeq: 103 INVITE<br>
            X-ISUPMtype:0c<br>
            Reason: Q.850;cause=41;x-source=a<br>
            Content-Length: 0<br>
            <br>
          </p>
          <p>this is the same packet viewed in Homer</p>
          <div class="tab-pane ng-scope active" ng-repeat="tab in tabs"
            ng-class="{active: tab.active}"
            uib-tab-content-transclude="tab">
            <div id="sippath" ng-show="showSipMessage" class="sipmessage
              ng-binding ng-scope">2017-01-06 14:13:59 +0000 :
              141.170.24.20:5060 -> 192.168.36.141:5060</div>
            <div id="sipmsg" ng-show="showSipMessage" class="sipmessage
              ng-binding ng-scope" data-ng-bind-html="sipMessage">SIP/2.0
              <font color="red"><b>500</b></font> Service Unavailable
              Via: SIP/2.0/UDP 141.170.9.156:5060;branch=<font
                color="green"><b>z9hG4bKd116.a30f9976.0</b></font> From:
              <a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
                href="sip:442035420637@192.168.36.68"><sip:442035420637@192.168.36.68></a>;tag=<font
                color="red"><b>as55dfe54a</b></font> To: <a
                moz-do-not-send="true" class="moz-txt-link-rfc2396E"
                href="sip:+447910705624@141.170.24.20"><sip:+447910705624@141.170.24.20></a>;tag=gK00d54f0d
              Call-ID: <font color="blue"><b><a moz-do-not-send="true"
                    class="moz-txt-link-abbreviated"
                    href="mailto:492956a7483fc8345bfdaf6c17212008@192.168.36.68:5060">492956a7483fc8345bfdaf6c17212008@192.168.36.68:5060</a></b></font>
              CSeq: 103 INVITE X-ISUPMtype:0c Reason:
              Q.850;cause=41;x-source=a Content-Length: 0 </div>
          </div>
          <p>the sip code and the callid have been changed. the call id
            is the same as the original call from the outbound asterisk
            box<br>
          </p>
          <br>
          Regards,<br>
          <pre class="moz-signature" cols="72">-- 
Richard Robson
Greenlight Support
01382 843843
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:support@greenlightcrm.com">support@greenlightcrm.com</a></pre>
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          <br>
          <pre wrap="">_______________________________________________
Users mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a>
</pre>
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        <br>
      </blockquote>
      <br>
      <p><br>
      </p>
      <pre class="moz-signature" cols="72">-- 
Richard Robson
Greenlight Support
01382 843843
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:support@greenlightcrm.com">support@greenlightcrm.com</a></pre>
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