Seven Du

Seven is the CTO and founder of Yantai Xiaoyingtao, as well as the founder of CherryCalls.com, and the founder of the FreeSWITCH Chinese Community. As a longtime FreeSWITCH code contributor, he took his many years of experience to write three books, available in Chinese – “FreeSWITCH the Definitive Guide”, “Kamailio in Action”, and “FFmpeg in depth”.