说明：  彩信打包文档(中文版),文档中介绍了彩信通信协议MM1,说明了彩信发送包的组成结构,包含的元素,还有收到状态报告的包的组成等等.
(MMS package documentation (Chinese version), the document described communication protocol MMS MM1, explains the composition of MMS sent packet structure contains the elements, as well as receive status reports, etc. The composition of the package.)