Abstract:

In order to achieve instant messaging and  share  resources in LAN（Local Area Network),a tool for instant communication of voice was designed and implemented.The network communication of the software used TCP/IP（Transmission Control Protocol/Internet Protocol） protocol and its procedural framework used the mode combing C/S（Client-Server) and P2P(Point to Point).P2P architecture was used to build the communications among clients and C/S structure was ased to connect the clients and the server.Simulation results showed that the tool can be easily interconnected to LAN and it has good performance of voice communication.

Key words: instant messaging, point to point(P2P), voice communication