会议电话汇接机在数字交换网中的应用孙嗣贤近几年，农村通信有了很大发展，许多县市实现了交换程控化、传输光缆化，建成了本地数字交换网。网络数字化后，原有的会议电话汇接机无法使用。而数字程控交换机本身具有的会议电话功能，最多只能有５个用户，不能满足召开会议... Conference telephone tandem machine in the digital switching network Sun Si Xian In recent years, rural communication has made great progress, many counties and cities to achieve the exchange of program-controlled transmission cable, built a local digital switching network. After the network is digitized, the original conference call tandem machine can not be used. The digital program-controlled switches itself has a conference call function, can only have up to 5 users, can not meet the convening of the meeting ...