Research And Development Of Access Gateway Based On SIP Protocol

Along with the evolvement of network system structure and the development of broadband technology, the transform from traditional network to NGN is inevitable. NGN will have wider service area. Its main goal is that the network structure supports real-time multimedia service, cuts short the time which service to market costs, supports multi-access method and multi-access endpoint, supports mobile nature, insures the smooth transform of the present network, and possesses economy and prolate.NGN is the complete new network which supports voice, data, fax and video services. In the developmental course to the future network, carriers more and more distinctly know that service has become the most important factor which makes them different from others. Thinking in Softswitch generates from the intense requirement of NGN constructure.Softswitch separates call control functions from media gateway. It uses software-based methods to implement call control functions such as call connection, call processes selection, and call routing,etc. On one hand, Softswitch enable network convergence, on the other hand, of much importance, Softswitch provide APIs which allow users other than vendors to develop and deploy new services into the network according to their need. Softswitch opens up the "sealed-box" style switching model, and push the network one step forward to an open, programmable network.Along with the continuous development of the Softswitch technique, people are paying attention to weather the Softswitch is able to inherit the traditional speech business. At the same time, they begin to concentrate them on how to support multimedia business better with the Softswitch system.. They hope to promote the ability of the whole network providing business with the Softswitch.At present, the main service and profit of the telecommunication service come from the traditional telephone and mobile telephone, the emergence of VOIP technology amalgamates the traditional voice telephone and internet, and provides the chance for new carriers entering into voice area. There is much disputed on the technology way and standard establishment of developing VOIP and 3G mobile telecommunication. Thus, how to choose correct stratagem of constructing core network is very important first step.