Design And Implementation Of Sip Stack

In recent years with the development of the Internet, many new technologies arise at the historic moment. Here to talk about the SIP is one of them, because it is based on the Internet, make its low prices, flexible, and other business characteristics, has become the World’s fastest growing application technical one. Many organizations and companies also have attention in the field, as these promoter continuous efforts to study the work, also produced many of the relevant standards. Among them the IETF SIP protocol was put forward more and more concern and support.This paper to SIP the realization of the phone as a soft research content, and according to the advantages and disadvantages of the traditional telephone to SIP the relatively new concept IP phone agreement are analyzed, the design come out a SIP protocol based on the server IP phone system, and to achieve.Early IP telephone agreement using h.322agreement realize the telephone signaling mode, facilitate with existing PSTN network connection, whether from a development perspective or application is relatively complex much; And SIP (session Initial Protocol agreement is to solve the existing problems and the IP network developed a new agreement, actually, is based on a HTTP (hypertext transfer Protocol of SIP Protocol version). In order to realize the IP phone system has better flexibility, more simple structure, call setting up time short, and to realize the characteristics such as the business of intelligent business, supplement or distributed control also puts forward the solutions.The most important thing in the process of the SIP call is registration service and the positioning service. To make the system has a faster processing speed; we need try to shorten the two parts of the processing time. So in the process of design, we need integrate Redirect (redirection services), Registrar (registration service) and Location Server (position service) based on a body to achieve. So as to achieve higher processing speed, more short call processing time delay.Finally,according to the system, we work some tests, and give the results.