System Software Design And Implementantion Of The Voip Voice Gateway

VOIP(Voice Over IP)is a general term for a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.Compared to the circuit-switched public telephone network, VOIP provide a cost-efficient communication solution and easy integration voice witch data services. Associated with the implementation and deployment of IPv6, which bring a lot improvement and enhancement of QoS, the criticized quality of VOIP communication is expected to be resolved.These advantages stated above are attracting more and more company and even network operators, giving the traditional network operators enormous pressure and challenges. Along with the evolution of wireless communication technology and the deployment of 3G, cell phone is not just a voice communication device but a device with a wide rang of wireless connection and data service, providing miscellaneous function including VOIP. So it is worth studying and researching VOIP technology.The VOIP switch discussed in this paper is a typical embedded system, which is designed and implemented in our lab independently; it was composed of three major components including a MPC860 general purpose processor, a TI C549 digital signal processor and an Altera FPGA.This paper focus on the design and implement of VOIP switch using the GNU/Linux system, which will decreasing the cost, providing much more flexible and make our product much more competitive. Task finished in the project including:(1)Real time analysis: Analysising real time capability of Linux kernel.(2)Boot loader implement: Providing a way to load the Linux kernel.(3)Porting the Linux kernel: Fulfilling the the kernel inititialization(4)Implement the major device driver: Providing debug methods.This paper pays an intensive attention to VOIP switch system software implement. First, it gives an introduction about the VOIP system, second it give an analysis of Linux kernel real time capability, then do a lot of coding and debugging and finished the porting process. At last, it summarized the embedded system development, giving a guideline and reference for research in this field.