为了节约无线领域的带宽资源，表中分配数值即为每个域名关键字使用预定义的二进制编码，MMS PDU封装的二进制编码的基本编码机制来源于WAP/WSP，最优化在空中传播的数据量。MMS PDU生成及翻译是MMS客户机程序的重要组成部分。其它类型的PDU头域大致和发送请求(M-Send.req)的头域是类似的。-MMS PDU header field in order to save the wireless bandwidth resources allocated in the table value is predefined for each domain name keyword binary encoding, the basic encoding mechanism of the binary encoding of MMS PDU package from the WAP/WSP, optimized in airborne data. MMS PDU generation and Translation is an important part of the MMS client program. Other types of PDU header field is broadly in line and send the request (the head domain of the M-Send.req) is similar.