本文描述彩信的架构，彩信的交互过程，彩信的PDU-This article describes the MMS architecture, multimedia interactive process, MMS PDU

ＳＭＰＰ协议 3.1ＳＭＰＰ规范简介 ＳＭＰＰ接口协议最初由ＥＴＳＩ收录在　ＧＳＭ０３.３９规范中，描述了短消息中心与短消息实体之间通信交互的协议关系及数据传输格式，-About SMPP protocol SMPP interface specification 3.1SMPP agreement initially included in the ETSI specification GSM03.39 describes the SMS Short Message Cen

java版短信交互系统，比较陈旧，做类似项目可以参考-java version of the SMS interactive systems, relatively old, doing a similar project can refer to