Request route

request_route {
	if ((($Rp == MY_WS_PORT || $Rp == MY_WSS_PORT)
                && !(proto == WS || proto == WSS))) {
                xlog("L_WARN", "SIP request received on $Rp\n");
                sl_send_reply("403", "Forbidden");
                exit;
        }

	# per request initial checks
	route(REQINIT);

	# NAT detection
	route(NATDETECT);

	# CANCEL processing
	if (is_method("CANCEL")) {
		if (t_check_trans()) {
			route(RELAY);
		}
		exit;
	}

	# handle requests within SIP dialogs
	route(WITHINDLG);

	### only initial requests (no To tag)

	t_check_trans();

	if (!is_method("REGISTER|INVITE|ACK|BYE|CANCEL|PRACK|MESSAGE|INFO|UPDATE")) {
		sl_send_reply("405", "Method not allowed");
		exit;
	}

	# authentication
	route(AUTH);

	# record routing for dialog forming requests (in case they are routed)
	# - remove preloaded route headers
	remove_hf("Route");
	if (is_method("INVITE|SUBSCRIBE")){
	record_route();
	}
	# handle registrations
	route(REGISTRAR);

	if ($rU==$null) {
		# request with no Username in RURI
		sl_send_reply("484","Address Incomplete");
		exit;
	}

	if (!is_method("INVITE")) {
		route(RELAY);
		exit;
	}

	route(PSTN);

	route(LOCATION);
}