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Dtmf tone detect through modem

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sribangaram

sribangaram

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Dear friends Please tell me any body I want to get DTMF tone through MODEM(VISIONTEK GSM MODEM 82GM)
Explanation : I have to done DTMF decoder It's working fine but only through Mobile
I I want to connect Mdem (VISIONTEK GSM MODEM 82GM) but their is no head phone socket only db9pin female connector
Please help me any body how i will connect to decoder
My Decoder is MT8870
 

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