I'm currently using Kamailio built from master@e59db79 and have been following 
the recent threads about the dialog module as I'm moving toward adding dialog 
support for presence and CDRs in my setup.

However, I seem to have come across an issue where dlg_setflag() does nothing, 
while setflag() works properly with the following (trimmed) script.  So for 
now, I issue setflag(FLT_DIALOG) for INVITE rather than 
dlg_setflag(FLT_DIALOG).

Is there something I'm missing about dlg_setflag()?

#!define FLT_DIALOG 4
request_route {
	route(REQINIT);
	route(NATDETECT);
	if(is_method("CANCEL")) {
		if(t_check_trans()) {
			route(RELAY);
		}
		exit;
	}
	route(WITHINDLG);
	if(t_precheck_trans()) {
		t_check_trans();
		exit;
	}
	t_check_trans();
	route(AUTH);
	remove_hf("Route");
	if(is_method("INVITE|SUBSCRIBE"))
		record_route();
	if(is_method("INVITE")) {
		setflag(FLT_ACC);
		# Enable dialog support (dlg_setflag not working)
		#dlg_setflag(FLT_DIALOG);
		setflag(FLT_DIALOG);
	}
	route(SIPOUT);
	route(PRESENCE);
	route(REGISTRAR);
	if($rU==$null) {
		# request with no Username in RURI
		sl_send_reply("484","Address Incomplete");
		exit;
	}
	route(PSTN);
	route(LOCATION);
	route(RELAY);
}

route[WITHINDLG] {
	if(!has_totag()) return;
	if(loose_route()) {
		route(DLGURI);
		if(is_method("BYE")) {
			setflag(FLT_ACC);
			setflag(FLT_ACCFAILED);
			# Testing dialog flag
			xlog("L_INFO", "Completed $dlg(from_uri) to 
$dlg(to_uri) - $DLG_lifetime duration\n");
		} else if(is_method("ACK")) {
			route(NATMANAGE);
		} else if(is_method("NOTIFY")) {
			record_route();
		}
		route(RELAY);
		exit;
	}
	if(is_method("SUBSCRIBE") && uri==myself) {
		route(PRESENCE);
		exit;
	}
	if(is_method("ACK")) {
		if(t_check_trans()) {
			route(RELAY);
			exit;
		} else {
			exit;
		}
	}
	sl_send_reply("404","Not Found");
	exit;
}