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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