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Regarding SIMCOM DTMF Tone Detect

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sakibnaz

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Hi all.

I need to detect DTMF Tone from a Voice call using SIMCOM SIM900D Module. I found document "SIM900_DDET_Application Note_V1.01".

As per the document I executed command AT+DDET=1, but SIM900D reply is ERROR.

Any advise please, why Module reply is ERROR or how to achieve this DTMF detection (without using external chip)?

Regards.
 

Execute AT+CGMR=? See what it says
 

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