自从1876年贝尔发明电话以来,电话作为人与人之间通讯的工具,已渗透到人们生活的各个方面,并成为不可缺少的交流手段。发展至今,电信技术从满足简单的语音交换,进入到提供语音、数据、图像全方面多媒体的通信水平。中国电信产业在20世纪取得了巨大的成就,21世纪面临世界电信的 Since Bell invented the telephone in 1876, the telephone as a communication tool between people has penetrated into all aspects of people’s lives and become an indispensable means of communication. Since its inception, telecommunications technology has evolved from satisfying simple voice exchanges to providing multi-media communication across all aspects of voice, data and imaging. China’s telecommunications industry has made great achievements in the 20th century, facing the world’s telecommunications in the 21st century