loadmodule "tm.so"

loadmodule "pv.so"
loadmodule "xlog.so"
loadmodule "sl.so"
loadmodule "siputils.so"
loadmodule "tcpops.so"
loadmodule "textops.so"
loadmodule "rr.so"

loadmodule "stun.so"
loadmodule "outbound.so"
modparam("outbound", "force_outbound_flag", 1)
modparam("outbound", "flow_token_secret", "kamailio")

loadmodule "debugger.so"
modparam("debugger", "cfgtrace", 1)
modparam("debugger", "log_level_name", "exec")

request_route {
loose_route();
switch($rc) {
case -3:
xlog("L_ERR", "loose_route code -3\n");
break;
case -2:
xlog("L_ERR", "loose_route code -2\n");
break;
case -1:
xlog("L_ERR", "loose_route code -1\n");
break;
case 1:
xlog("L_ERR", "loose_route code 1\n");
break;
case 2:
xlog("L_ERR", "loose_route code 2\n");
route(TRY_TCP_CONN);
break;
}
record_route();

if (has_totag()) {
	t_relay();
} else {
	t_relay_to_udp("127.0.0.1", "5080");
}

}

route[TRY_TCP_CONN] {
if($(du{uri.transport}{s.tolower})=="udp") {
return;
}

$var(host_port) = $_s($(du{uri.tosocket}{s.tolower}{re.subst,/^tcp://}));
if(!tcp_con_alive("$var(host_port)")) {
	sl_send_reply("430", "Flow Failed");
	exit;
}

}

</details>

Can something be used with the `UDP` transport? Usecase: "outbound client" uses UDP, and the Kamailio outbound module sends keepalives to the client.  When no response, then send "430 Flow Failed" response.