A GPRS module / modem with its EASY GPRS feature can be seen as a special device, embedding and controlling the PPP/(UDP)TCP/IP protocol stack inside itself. In this way the Localhost sees a "virtual serial line" connection with the application software on the Server machine.
Rough EASY GPRS Equivalent device (modem connection + ISP Access Machine + TCP/IP stack)
Differently from other GPRS devices that embed the TCP/IP protocol stack; an EASY GPRS device does not provide a set of API functions to interface with the protocol stack but it automatically manages it internally as specified when starting the connection. This completely relieves the designer from TCP/IP managing and knowledge. The connection through the internet with a remote host Application layer residing on the server can be done as easily as a CSD data call, by following the steps: