communication using GPRS modem

I an using GPRS modem SIM300 (with inbuilt TCP/IP stack).

The modem is connected to serial port of PC and controlling it through hyper terminal. I am able to connect to standard sites like google....and it is not a problem

The same PC is connected to BSNL boardband through a bsnl modem. The ip connection is on basis of dynamic ip (as usual) which changes every time but one can know it.

I do not have access to any static ip and to illustrate the data communication over IP network using GPRS i want to send the data from my GPRS modem (through hyperterminal) to my PC using dynamic ip of broadband i.e. data transfer between ip of GPRS modem and IP of broadband.

Kindly let me know how can i manage this at PC end?

IP of my PC and the dynamic ip of modem are different how can this be matched.?

try with specified port no to send the data on which you port you want to send the data of your pc and check on your firewall that you received that data or not.because port definition is required.