After the rapid growth in the 1990s , by the end of 1999 beijing telecom had 3 . 2 million fixed - line telephones and 1 . 5 million mobile phones in operation 北京市的电信事业经过90年代的高速增长，到1999年的下半年,固定网电话达到320万门，移动电话接近150万部。
The commerce , industry and technology bureau regards that combining fixed line telephone service with mobile phone service as the trend in the future due to advanced technology and service development 工商及科技局认为，随著新科技及服务不断发展，固网与流动电话服务汇流将是大势所趋。
The commerce , industry and technology bureau regards that combining fixed line telephone service with mobile phone service as the trend in the future due to advanced technology and service development 工商及科技局认为，随著新科技及服务不断发展，固网与流动电话服务汇流将是大势所趋。
A legislative decree published by the cape verde government says that on january 1 2006 the exclusivity of cv telecom will come to an end in terms of providing a fixed - line telephone service as well as installation setting up and exploration of the telecommunications network that supports them 佛得角政府颁布的法案称， 2006年1月1日起，佛得角电信cvt在“提供固网电话服务安装以及建立和探测电信网络”方面的独占地位即将结束。
Urban telephone subscribers refer to subscribers telephone subscribers , located at municipalities , cities under the jurisdiction of province , cities at prefectural level , downtown and suburb of city at county level town and county towns ( including country towns where county government located , and towns of county level according to the administrative organizational system ) , that are connected to the public line telephone network , including rural mineral area , forest area , military area 城市电话用户指直辖市、省辖市、地级市、县级市的市区、市郊区及县城（包括县人民政府所在地的县城关区或行政建制相当于县人民政府所在地的镇）范围内接入局用交换机的电话用户数，包括分布在农村地区的独立工矿区、林区、驻军等接入局用交换机的电话用户数。
Hands - free speech communication is indispensable in audio and video conference systems , hot - line telephones and videophones , mobile radio terminals , digital isdn network etc . however , the control ( cancellation ) of the acoustic echo has always had a strong impact on the transmission quality in hands - free telecommunication ~ [ 1 - 3 ] conventional methods of acoustic echo control ( cancellation ) , such as echo suppression or gain control , may lead to the degradations in speech quality or make the speakers feel uncomfortable 免提式话音通信在移动电话、热线电话、车载电话及isdn网的电视电话会议等多种领域正得到日益广泛的应用。但至今的免提式话音通信中，仍免不了受回声引起的话音失真、甚至啸叫等干扰，大大降低了免提话音通信的质量。由于声回波对消问题尚未得到圆满解决，实现高质量的免提式话音通信仍是一个极赋挑战性的课题。
