In VoIP networks, SIP encourages the convergence of telephony and web-based services. The web phone has become an attractive tool for developing VoIP services. In this paper, we use open source software to build VoIP platform providing the web phone, voice, video, IM, and prepaid services. A billing system and web pages are also developed for the administrator providing the administrative functions. The VoIP users can also see their call detail records in real time. Experimentations are conducted showing that our system can accommodate 400 calls per second without loss. If the bottleneck component is moved to a standalone server, this number is nearly doubled.
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