public function set($use_radius, $accounting, $interim_update) {
        $sentence = new SentenceUtil();
        $sentence->addCommand("/ppp/aaa/set");
        $sentence->setAttribute("use-radius", $use_radius);
        $sentence->setAttribute("accounting", $accounting);
        $sentence->setAttribute("interim-update", $interim_update);
        $this->talker->send($sentence);
        return "Sucsess";
    }