https://blog.wongcw.com/2022/12/05/google%e9%97%9c%e9%96%89%e7%b7%9a%e4%b8%8a%e7%89%88duplex%e8%aa%9e%e9%9f%b3%e8%a8%82%e7%a5%a8%e5%b7%a5%e5%85%b7/