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hello, i need a help i am connecting a gsm modem to micro controller and called to that modem frm a mobile, by using AT command i can receive it, when the called person pressing some key for ex if he is presses '1' key ,then that number has to pass to micro controller by modem is it possible? pls help me arunanjster@gmail.com
I don't think DTMF signalling works to a GSM terminal.
Therefore, I think you'll have to use SMS or a Data call...