It supplements today's Circuit Switched Data(CSD) and Short Message Service. 它利用现有的移动电话网络发送和接收信息,是现有的电路交换技术和短消息服务的一个补充。
The communication of multimedia is mostly based on the Circuit Switching in the past, and with the improvement of the foundation of data operation, the tendency is based on the packet switched data network. 以往的多媒体通信业务主要基于电路交换网络,随着基础数据业务的快速稳定增长和网络规模的持续增长,多媒体通信业务的发展趋势将基于包交换网络,如IP网络。