The traditional voice and its added service can be integraed, and some new real time service over IP network can be provided. The architecture of SIP protocol based on distributed design supplies high flexiblity and scalablity to the mobile devices. This can offer a standard and highly scalable platform for more added services providers and advance the the flat iron shop for us development of VoIP technology.This thesis focuses on the key technologies of VoIP multimedia application based on SIP protocol on mobile phone terminal. The thesis first introduces the technical background and architecture of the VoIP, then elaborates three key technologies. Next, it has blog lace wedding dresses described the important protocol SIP in VoIP architecture.The definition, functionalities, components, message and protocol architecture of SIP is introduced. According to the function of the wedding gowns dresses terminal, SIP protocol stack is designed to implement voice over Internet protocol functionality. The necessary functional modules are designed, incnluding the user agent in cheap evening dresses architecture, the transmission of real-time data and the processing of the audio data, among which the user agent module is paid more attention. Then, on the basis of modular software development concept, the custom made prom dresses software is developed, the related data structures such as classes and functions are defined and the functional modules are implemented.At last, the developed system is tested under local area network with SIP proxy server. The test result shows that the functions of SIP model in mobile phone terminal can be implemented. The effect of time delay, jittering and packet loss on voice quality is assessed according to the tested results.
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