Abstract: The VoIP experiment training platform is one of the “triple play” National Experimental Teaching Demonstrating Center training platforms. This paper introduced the network formation of the VoIP experiment training platform and the experimental contents setting, and through these processes, building an open, scalable VoIP platform which is similar as ISP, to meet the needs of the teaching and research. Not only the VoIP system is in this platform, but also PSTN platform and MSTP/SDH platform can be used to construct the whole network with it. It can help students learn the communication networks through doing some design and test trainings of networks, and improve their ability of the engineering practice. In addition, students can do some research and develop some other services through the API in the platform, and improve their research ability.