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Dtmf detection with sim900

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selfish

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I am facing a strange situation with DTMF detection with SIM-900. I activate DTMF detection with AT+DDET=1 and everything works fine. The problem is with digit 4 and 5. I receive nothing when these digits are pressed from the calling phone. Has anyone experienced this?

I am using firmware - 1137B03SIM900M64_ST_ENHANCE (1).cla for the SIM-900.
 

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