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Research on Design and Implementation of H.323 Videotelephone Communication Software Protocols

Author: ZhangPengFei
Tutor: WangGuoYou
School: Huazhong University of Science and Technology
Course: Pattern Recognition and Intelligent Systems
Keywords: H.323 H.245 Visual telephone Communication protocol stack to achieve
CLC: TN949.2
Type: Master's thesis
Year: 2005
Downloads: 162
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Abstract


China Communication Network Broadband and IP trend to promote the continuous expansion of multimedia communication services . Currently, international web conferencing software and Internet telephony software follows two criteria : SIP H.323 protocol suite and the IETF, ITU - T developed . SIP and H.323 agreement compared to the simple , good expandability and scalability as well as the existing portfolio of Internet applications close . Compared with SIP , H.323 appeared earlier , H.323 is more mature H.323 protocol has many commercial applications , H.323 protocol will be a long period of time , and SIP coexistence, the H.323 program has an important practical value. This paper analyzes the characteristics of the H.323 standard , the H.323 protocol stack composition and functions of the various components , characteristics , and H.320 , H.324 terminals were compared . And a detailed description of the communication protocol stack H.323 protocol H.245 and H.225 role , as well as signaling interaction . Detailed analysis and elaboration followed H.323 standard video telephony implementations , modules and function of each module . Program implementation , custom message queue , reducing the number of run in the copy of the data , and improve the efficiency of the program to run , but also improve the controllability of the program ; using custom memory management to eliminate the potential threat of external memory fragmentation sustainable program run . Protocol analysis tools to function and stability testing , interoperability testing implemented in this article videophone videophone products with other manufacturers . The test results show that : the videophone product complies with the H.323 standard , good interoperability with other H.323 protocol terminal operation . Finally , according to the current situation , the analysis of the shortcomings in the implementation , and the direction of future efforts .

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