1 May
2014
1 May
'14
8:54 p.m.
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.
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.
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.
Snippets of my cfg and logs are below. The con_reuse flag is checked in tcp_send at
tcp_main.c:1846
Regards,
Hugh
route[RELAY] {
xlog("L_INFO", "$rm: route[RELAY]\n");
loose_route();
$var(lr_ret) = $rc;
if ($var(lr_ret) == 2) {
xlog("L_INFO", "$rm: loose route with
outbound\n");
t_on_failure("FAIL_OUTBOUND");
set_forward_no_connect();
if (t_relay() < 0) {
xlog("L_WARN", "$rm: loose route with
outbound failed\n");
sl_send_reply("500", "Something bad
happened");
}
exit;
}
. . .
}
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: Routing logic starts
here
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[REQINIT]
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[INITIAL_REQUEST]
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[RECORD_ROUTE]
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: route[RELAY]
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: INVITE: loose route with
outbound
May 1 17:01:08 kamailio-cep[28226]: ERROR: tm [../../forward.h:219]: msg_send():
msg_send: ERROR: tcp_send failed
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
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: ACK: Routing logic starts here
May 1 17:01:08 kamailio-cep[28226]: INFO: <script>: ACK: route[REQINIT]
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