The Design And Implement Of Embedded IP Phone Terminal Based On SIP Protocal

SIP, Session Initiation Protocol, was initially proposed by IETF as an IP phone signaling protocol. It has been playing an important role in many fields including Voip, soft switch, NGN and 3G.SIP (Session Initiation Protocol) is an application-layer control(signaling) protocol for creating,modifying, and terminating sessions with one or more participants. It can amalgamate traditional telecommunication network application into Internet application and break the traditional telecommunication service model,it provide muti-media service based on IP with Internet rules, so IP Phone which use SIP as signaling protocol become a choice by more and more developers.Therefore, the paper presents the thought that applying SIP to the embedded system, and conducts the study of SIP and the design of an embedded IP Phone based on MIPS. This task of the paper is as follows:1. Deeply research on SIP architecture including SIP Protocol, message mechanism, signaling flow and some other critical technique, such as registering process and reliability. SIP Discussing and analyzing the superiority and the characteristic of SIP when it is applied to embedded environment.2. Analyzing the key questions when designing the embedded application system based on SIP. Designing and realizing the embedded SIP telephone terminal based on MIPS in LAN. Aiming at this telephone terminal, presenting the program of how to design and develop embedded SIP application system from hardware and software.3. The paper also optimizes embedded Nucleus system and application according to the system hardware and software platform in various ways, which greatly improves its speed and efficiency.