本研究中實作VoIP在Embedded System的系統上，並提供聲音與影像的結合和聲音訊號加密。其中VoIP以目前而言並非嶄新的技術，但如何提高附加價值是值得努力的課題。本論文中分為兩大主軸，一為由軟體觀點出發由下到上介紹軟體結構，另一方面由硬體觀點敘述發展嵌入式實驗平台的硬體線路，最後再整合軟體與硬體平台實現整個VoIP在嵌入式系統的實際運用，並在其VoIP整合平台上發展聲音與影像的結合與在通訊封包上施以加密機制以強化通信安全。最後期望以此VoIP整合平台能作為日後驗證新技術的基礎。

Voice and Video over IP is about transmitting the formations across an IP network, the classical application of VoIP is as a telephone alternative. This thesis first introduces the IP network, then on security point of view RTP architectures designed for VoIP communication. Then continues with discussing the hardware of embedded system. And finally presents some of VoIP SIP protocols on embedded system. The Internet Protocol (IP) is a part of the TCP/IP architecture. The protocol itself offers only a best-effort service. Security of VoIP is considered right from the beginning, and parallel with the development in other areas of VoIP. Many security mechanisms are already defined in the standards but they also have some flaws and many security problems remain unsolved. Base on The IP network construct in order to encrypt the mechanism by strengthening the communication security on the package in communication of VoIP.
This platform cans foundation of new technology in the future to expect finally.

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