一本很不错的描述消息服务的电子书，下载地址可以到http://www.ebookee.com.cn上面去搜索 

Building on the success of the first edition, Mobile Messaging Technologies and Services Second Edition has been revised and updated and continues to provide an in-depth description of existing and forthcoming messaging services and underlying technologies. The Short Message Service (SMS) has been a tremendous success in the messaging roadmap and Enhanced Messaging Service (EMS), an application-level extension of SMS, has provided a smooth transition to the recently introduced Multimedia Messaging Service (MMS).

Key features:
Explains and illustrates services including the Short Message Service (SMS) and the Enhanced Messaging Service (EMS)

Offers a complete description of the new Multimedia Messaging Service (MMS)

Illustrates the most common examples of messaging applications usage and covers advanced topics for operators involved in the deployment and configuration of mobile messaging systems

Describes the processes involved in standardizing telecommunications services and technologies (3GPP, WAP Forum, IETF and W3C)