Patent ID: 6965583

Claim:
A TCP/IP (Transmission Control Protocol/Internet Protocol) communication system comprising: a provider side unit to which a first communication terminal is operatively connected through a line network; and a mobile switching controller to which a second communication terminal is operatively connected, and wherein said mobile switching controller comprises: a first termination circuit connected between said mobile switching controller and said provider side unit to transfer data on a first channel from said second communication terminal to said first communication terminal; a second termination circuit connected between said mobile switching controller and said provider side unit to transfer data on a second channel from said first communication terminal to said second communication terminal; a detecting unit which is connected to said first and second termination circuits, and detects an IP address and a first message from first data as said data transmitted from one of said first and second communication terminal, and a second message from second data as said data transmitted from the other, wherein said first message is detected when said first data has a finish flag and an acknowledgement flag which are set, and said second message is detected from said second data responding to said first data and having an acknowledgement flag which is set; a line signal circuit which converts said IP address into a terminal number; and a switch which releases said first and second channels associated with said terminal number.