https://rein.kr/posts/2009-07-24-%EC%9E%98%EB%AA%BB-%EA%B1%B8%EB%A0%A4%EC%98%A8-fax-%EB%95%8C%EB%AC%B8%EC%97%90-%EB%96%A0%EC%98%A4%EB%A5%B8-%EA%B8%B0%EC%96%B5/