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The Research and Application of VoIP Communication System Based on Soft-switch

Author: HuangLiang
Tutor: ChenHePing
School: Wuhan University of Science and Technology
Course: Pattern Recognition and Intelligent Systems
Keywords: Softswitch VoIP H.323 protocol SIP protocol Asterisk
CLC: TN916.2
Type: Master's thesis
Year: 2011
Downloads: 80
Quote: 0
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Abstract


Currently, most domestic enterprises have access to data networks, and to carry out a variety of services on the network, such as office automation. How to make the internal data network to bring greater efficiency to the enterprise is a very real problem of enterprises consider, on the one hand, consider the data network, improve work efficiency, but also to consider how to save communication expenses. A common practice is to: voice services through existing data network. The concrete realization: IP PBX server on the increase in the original network, voice communications through additional VoIP gateway or IP phone to the network of the headquarters and branch structure, and can also provide traditional voice interface with existing PBX connected to bypass long-distance calls to the IP network, so as to save on long distance calls, while providing a wealth of value-added services. IP PBX is an IP-based PBX, with the ultimate aim is to replace the existing PBX. With existing PBX structure is not open, and the ability to provide value-added services and IP-based PBX open and expand capacity significantly enhanced. If the IP PBX and NGN networks combined, increase the number of value-added services, and truly meet customer needs. A lot of open source software IP PBX, Asterisk is undoubtedly one of the best known, the most used, most influenced a goal of the design is pure IP core IP PBX. This paper focuses on VoIP the principle and Asterisk application research, two enterprise VoIP communication system model is established on the basis of the study, and given the system design of enterprise-based VoIP conference call. First, we discuss the two major VoIP protocols-H.323 and SIP (Session Initiation Protocol) protocol, the analysis of the model and the works of the two protocols, compare their different; Secondly softswitch platform kernel modules in Asterisk and Asterisk call flow; Finally, this paper has established two softswitch-based VoIP communication system model and gives design based VoIP telephone conferencing system. The conference call can be deployed according to the characteristics of the single-site deployment model and multi-site WAN distributed call processing model, the site internal conference call and cross-site offsite conference calls and other communication functions. The paper also made a summary of the the Asterisk existing and future development direction and outlook, especially for the IAX protocol support and development of existing platforms for H.323 further to make it more adapted to the needs of practical application.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Phone > Telephone lines, telephone network
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