I have a new required functionality. that is
Develop a Client server application that will communicate using a normal modem with out connecting to internet.(Client with a PC and modem will dail the number of server it will be a PSTN number (Not an ISP like thing) and the server with modem will recieve the call and receive some data and return results).
Direct communication like hyper terminal. no connection to internet.
i have tried TAPI(C#) and JTAPI (java) but dont get sucess.