siemens mc35i drivers
For PC connection, the initialization string AT+CGDCNT=1,"IP","internet" has been set the APN name, "internet" which depends on your operator. Once you setup a dial-up networking adaptor, add this init string to a generic modem driver, let say, "generic 33600bps modem driver" and ask it to dial to "*98*1#", it would attach to the GPRS network and start PPP connection. Once success, The GPRS network server would assign a dynamic IP address to your MC35i (which is not a fixed IP). While for the TCP port no., in the PC, for each protocol such as HTTP it is fixed. For your own TCPIP application, you can use your own. (Note: Be careful, some GPRS service package would only allow you to use pre-defined port no. for data transfer, so pls. check with your GPRS service provider).