Send sms from AVR memory with GSM modem and without any PC

Hi Dear all !
I have a BIG problem . I want to send and recive sms from my AVR memory with GSM modem and without any PC . I searched in web but people referd me to this atmel application note"AVR232:Interfacing GSM modem"(doc8016) . But in this article there is a PC , and AVR is only an Interface . I want to send it with only AVR .Please help me .
Regards
h.b.golestani@...