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Design and Implementation of VoIP Gateway

Author: WangDaYong
Tutor: HeJiaBin
School: Wuhan University of Technology
Course: Communication and Information System
Keywords: VoIP Gateway H.323 protocol TCP / IP protocol Embedded Systems
CLC: TN915.05
Type: Master's thesis
Year: 2006
Downloads: 286
Quote: 3
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Abstract


In recent years, Internet has been rapid development and universal application, as its dominance of the IP protocol architecture of the core technology in the data network architecture has been widely recognized. At the same time, with the application technology based IP technically proposed, especially the proposal of the VoIP technology, making data network communication gradually integrated into the traditional voice business. VoIP ie Voice over IP, it is an advanced means of communication, voice communication using the IP network, is an entirely IP network-based voice transmission technology. By voice gateway, softswitch platform, gatekeeper, a variety of supported platforms and devices such as the analog signal digitized data is then compressed into packets, voice transmission through the IP network to the destination address. The destination address of the packet was received after the data reorganization, decompressed and then restored into an analog signal, thereby completing a voice communication process. As VoIP technology continues to mature, making it possible Internet connection instead of the traditional telephone line for voice calls. VoIP network gateway, gatekeeper, support systems, as well as the telephone network and IP networks, and other parts. VoIP Gateway is a VoIP network terminal equipment, technology-based PC-based hardware Phone majority of products currently on the market is a PC-based. In this paper, the design of the H.323 protocol-based VoIP terminal, which is a typical system based on the embedded hardware Phone can achieve real-time voice communication between the phone and the phone. IP telephony network, voice gateway plays a very important role, it is able to achieve the PSTN network to the IP network data format conversion, and signaling and protocol conversion, so the play to the Internet network and the public telephone network connection up a bridge. Analog voice interface, either connected enterprise small switch can also be connected to a telephone or fax machine. Ethernet interface to access the IP network to provide real-time, high-quality voice service based on IP network transmission. This paper discusses in detail how to design and implement VoIP voice gateways. VoIP technology are introduced at the beginning of the paper. Briefly introduces the purpose and significance of the VoIP Gateway and the domestic and international situation and development of the technology, and also explained the key technologies involved in VoIP systems with the basic principles and the various protocols and voice gateways. After several existing gateway design proposed dedicated voice processor dedicated network processor voice gateway-based design, and then discussed in detail based on the ARM the network processor S3C4510B the specific implementations. Finally, detailed VoIP voice gateway hardware circuit design and software programming based embedded operating system VxWorks, the gateway system testing and results analysis.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > General issues > Communication network equipment
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