Exchanging packets between IP terminals in private networks connected through a public network

摘要

The present invention provides a packet communication service in a network system, wherein a plurality of private networks are connected to one another through a public network. When a voice call is established between Internet Protocol (IP) terminals included in respectively different private networks, packets can be directly exchanged between the IP terminals using public address information and port information of the IP terminals so that packet transmission delay can be minimized and network resources can be used efficiently. An embodiment of the invention includes directly exchanging voice packets of voice information and video packets of video information between IP terminals without passing through a switching system.