Regarding transfering data through GPRS

I am using MC9S12XDP512 micro conroller as a application host.Using this through serial port i send GPRS ACTIVATION AT commands to the Q24PLUS chip set .I have to send bulk of data through this using TCP/IP.I do not have much idea about this .Please help me in , how to use AT commands for this? ,how do i call a server? and how should i frame my data packet?

Is it essential that you use an external microcontroller?

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