Research And Implementation Of Value-added Services System Based On Android

According to the development of mobile communication technology and the popular of the smart terminal, the value-added services for mobile phone has became the hot issues. From the current status of China's telecommunications business, voice service is the most important basic telecom business. Voice service has been the main way to achieve communication between us. In current, using existence IP-based technology to develope voice business can not only improve utilization of network resources, but also have some market potential. As a result, how to provide personalized value-added services in smart terminal has became a problem need to study and solve. The call processing language(CPL)is a language designed for end users to create service based on Internet telephony. It is simple, extensible and powerful to describe a service. CPL is a signaling protocol independent language, it is anticipated to be used on SIP and H.323 network.This paper is based on the demand of developping value-added services in intelligent terminals.In this paper, research is emphasized on using CPL to develop value-added services, providing a new idea and framework of service platform. The thesis introduced the every part of the integration framework, such as function, detail designing. Firstiy, through the research of CPL and its relevant knowledge, because of the advantage of CPL such as flexibility reusability and extension, the thesis takes CPL as a key method to build the value-added services platform based on SIP. Secendly, study the structure and characteristic of XML documents, analysis XML file parsing techniques, finally, using the SAX method to analyze CPL script. Meanwhile combine with the research on the structure of Android platform, analyze the design principles and ideas that using to delvelop value-added services system in depth. The thesis has proposed a value-added services system based on C/S structure. In this system, uses SIP server to handle user's registe and call invite information and establish call connection between users.Client mainly has three functions, subscribing CPL business,analyseing CPL script and completing SIP call flow defined in CPL script.In the thesis, the system has been aviod feature interactions when server handle CPL script and lower extra expense when server handle a large number of concurrent call. According to rich the fundamention on value-based system, contact telephone recording,sip short message are also included. Finally, the paper also prospects how to perfect the level of value-added services, providing more perfect service.