| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系研究所 === 95 === Among the various internet application services, Voice over IP (VOIP) become the most popular application service in recent years. Currently, VOIP primarily follows SIP protocol. Therefore, this research is addressing on how SIP user agent program integrates into video IP Phone system and then implement it on the embedded development platform. The internet telephone is very convenient to people, but it does cause network system transmission burden. In this research, We propose a traffic control mechanism to resolve this issue. This mechanism effectively estimates internet bandwidth and subsequently controls the vedio data transmission to achieve instant and smooth video quality.
In this research, Linux is used as the operation system of the embedded development platform, and combined with WinBond W90221PA-RISC 32-bit as the embedded processor. SIP proxy server and embedded user agent program are used to implement internet telephone functions. We apply H.263 Video Codec and G.723.1 Audio Codec to reduce multimedia data size. RTP transmission protocol is implemented to achieve immediate two-way transmission. Finally experiment proves that this system truly can achieve the merit of VOIP software and at the same time bears with the convenience of the traditions telephone.
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