網際網路與全球資訊網的相關技術的出現為我們的生活帶來相當大且重要
的改變。在眾多的應用程式中，網路電話備受矚目，近來寬頻的盛行使得網路電
話的使用更加的方便。無論是傳統電信業者或是即將跟入電信市場的業者，提供
網路電話的服務是相當緊急且必要的。
利用網路電話來達成遠端監控系統來警示事件更是可以改善一般傳統式的
監控系統。傳統監控系統，使用電話線或專線作為傳輸媒介，終端設備也只能在
本地端執行監控任務，無法迅速且方便得知發生什麼事。若配合網路電話來設計
不只是可以達到基本的監控功能且即使人不在現場也可以即時的告知，讓損失降
得更低且增加了安全性和時效性。
本論文提出了結合VoIP 低廉語音傳輸成本與彈性且靈活的程式操控，構建
一個遠端監控警示機制，讓使用者可以在任何有網路可以連通的地方收取監控警
示訊息而為即時且必要之處置。在此篇論文中我們以螢幕保護程式為範例，加以
設計完成一個以網路電話為基礎進而達成遠端監控功能。

The vast progress in Internet and WWW related technologies have brought
dramatic and fundamental changes to the world that we live. Among the many
applications, VoIP has attracted a lot of attentions and it is regarded as one of the
Internet applications that would deeply affect human community. Sooner or later, the
VoIP service will be imperative to a great extent in the telephony market.
It is foreseeable that application of the remote monitoring systems via VoIP
instead of the traditional monitoring systems can be more flexible. The transmission
media of the traditional monitoring systems are telephone lines or special telephone
lines. The end-systems only be executed in local area. Functions of the monitoring
systems via traditional telephone system is limited. Design of a VoIP-based remote
alert system can provide alert function wherever the user is as such one can be
informed immediately when a particular event is triggered.
In this thesis, we use the screen protection program as an example to design a
VoIP-based remote alert system.

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