Zhao Houlin, secretary-general of the International Telecommunications Union (ITU), gives a speech at the opening ceremony of the World Telecommunication Standardization Assembly (WTSA) 2016 in Hammamet, Tunisia, Oct. 25, 2016. More than 1,000 figures from about 100 countries are taking part in this year's WTSA, which is held by the ITU every four years. (Xinhua/Liu Kai)
