With the development of the computer technology and networking,the information network, which mainly contains multimedia communications become the world's hot spots of concern.The great success of Internet makes IP one of the most important technologies of the future information network,the group with the core of IP has already become main stream of the evolution of telecommunication network .The IP Phone technology is a voice and fax communications technology transferred by IP networks, and it is high efficiency, low-cost in voice transmission, which makes it extensive applied in different scope,particularly, if it is combined with telephone network and multimedia technology, it can explore a variety of new business.
This article will introduce how to use Winsock to build client/server model to achieve wide-area network environment of the PC-to-PC IP telephony software on the Windows platform, under the VC++6.0 environment, on the TCP / IP protocol.
Key words:VoIP,audio, TCP / IP, VC + +6.0,Winsock