Description

I use TCP transport to relay SIP messages.
When Kamailio cannot connect to another server then Kamailio generates response 408 Request Timeout.
inside event_route[dialog:failed] route block I check error code $rs but this value is null.
This happens because Kamailio does not able to relay SIP messages and is not able to receive responses.
But tm module generates a response 408 Request Timeout and will be fine to init $rs pseudo-variable using tm module response.

Expected behavior

$rs pseudo-variable contains tm module response when kamailio does not receive a response from another server.

Actual observed behavior

$rs pseudo-variable contains null value when kamailio does not receive a response from another server.

To check you can use

event_route[dialog:failed]
{
    $var(code_xxx) = $(rs{re.subst,/([0-9])[0-9]{2}/\1xx/});
    xlog("L_INFO", "websocket|log|dialog failed $rs; $var(code_xxx)\n");
}

And relay SIP message to host that reachable.

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