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<p class="MsoNormal">I have an edge-proxy which accepts TCP connections from clients. When I know that the clients are behind NATs (for example), I use the set_forward_no_connect() function to force connection reuse and avoid timeouts. In the case where the
connection has already gone, the system sends a “477 Unfortunately error on sending to next hop occurred (477/TM)” response back to the registrar.<o:p></o:p></p>
<p class="MsoNormal">These connections are using outbound, so I would like to convert this into a “430 Flow Failed” response to the registrar, but the 477 response doesn’t seem to trigger the onreply_route or failure_route.<o:p></o:p></p>
<p class="MsoNormal">Is there a way of trapping and handling this failure? If not, do we need more flexibility in handling this particular tcp_send error (or other similar ones)? Other systems may wish to try additional destinations from the failure route.<o:p></o:p></p>
<p class="MsoNormal">Snippets of my cfg and logs are below. The con_reuse flag is checked in tcp_send at tcp_main.c:1846<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Hugh<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">route[RELAY] {<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:36.0pt">xlog("L_INFO", "$rm: route[RELAY]\n");<o:p></o:p></p>
<p class="MsoNormal"> loose_route();<o:p></o:p></p>
<p class="MsoNormal"> $var(lr_ret) = $rc;<o:p></o:p></p>
<p class="MsoNormal"> if ($var(lr_ret) == 2) {<o:p></o:p></p>
<p class="MsoNormal"> xlog("L_INFO", "$rm: loose route with outbound\n");<o:p></o:p></p>
<p class="MsoNormal"> t_on_failure("FAIL_OUTBOUND");<o:p></o:p></p>
<p class="MsoNormal"> set_forward_no_connect();<o:p></o:p></p>
<p class="MsoNormal"> if (t_relay() < 0) {<o:p></o:p></p>
<p class="MsoNormal"> xlog("L_WARN", "$rm: loose route with outbound failed\n");<o:p></o:p></p>
<p class="MsoNormal"> sl_send_reply("500", "Something bad happened");<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"> exit;<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"> . . .<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: Routing logic starts here<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[REQINIT]<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[INITIAL_REQUEST]<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[RECORD_ROUTE]<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[RELAY]<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: loose route with outbound<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: ERROR: tm [../../forward.h:219]: msg_send(): msg_send: ERROR: tcp_send failed<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: ERROR: tm [t_fwd.c:1609]: t_send_branch(): ERROR: t_send_branch: sending request on branch 0 failed<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: ACK: Routing logic starts here<o:p></o:p></p>
<p class="MsoNormal">May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: ACK: route[REQINIT]<o:p></o:p></p>
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