OpenH323是广泛应用的H323开源协议栈，该文档通过对一个典型的EndPoint与Gatekeeper之间进行通信的过程进行分析，来向初学者阐述OpenH323的运作机理，对于基于OpenH323进行开发的项目有重要参考意义。-OpenH323 is widely used open source protocol stack, this documents describe a typical process that how a connection established and data transfered between Endpoint and Gatekeeper to explore how OpenH323 operate. It s of great valueable for the programmer who want to develope project related to OpenH323.