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公用交换电话网是目前最普及的传输网络之一，在理想的多媒体通信网络ＡＴＭ尚未建成之前，能否开放多媒体通信业务是人们普遍关注的问题。为此，文章综述了近年来为在电话网上开展多媒体通信业务而研制的各种新技术，对其原理和应用进行了讨论。
Public Switched Telephone Network is one of the most popular transmission networks at present. Before the perfect multimedia communication network ATM has not been built yet, whether to open the multimedia communication service is a common concern. To this end, the article reviews various new technologies developed in recent years to develop multimedia communication services over the telephone network, and discusses its principles and applications.