Journal of Computer Science and Technology

, Volume 15, Issue 5, pp 480–484 | Cite as

Implementation of a prototype VoIP system

  • Liu Xicheng Email author
  • Li Timothy J. 


VoIP (Voice over IP) is a rapidly growing area with great market potential. To promote it for both commercial and research purposes, a prototype VoIP system based on state-of-the-art Motorola communication techniques has been developed. It is a gateway system integrating a PBX and a VoIP module. All components that H.323 defines to support VoIP are implemented in the VoIP module, though in a simplified manner. As an embedded system, the system features realtimeness and task distributiveness. A number of additional techniques are used to improve the performance, including noise suppression, zero copy, and buffer structure optimization. When refined in interoperability, the system will also readily serve as a product.


VoIP gateway gatekeeper communication common platform embedded system voice processing, H.323 


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  1. [1]
    Xiang Yangzhao, Liu Xicheng. An overview of VoIP technology and systems.Chinese Computer World Weekly, January 25 1999, (4).Google Scholar
  2. [2] Scholar
  3. [3]
    http://www.iptelephony.comGoogle Scholar
  4. [4]
    ITU-T Recommendation H.323 — Packet-Based Multimedia Communications Systems, 1997.Google Scholar

Copyright information

© Science Press, Beijing China and Allerton Press Inc. 2000

Authors and Affiliations

  1. 1.Centre for Communications Systems ResearchUniversity of CambridgeUK

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