PSTN DTMF not working with FreePBX

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greenhornet:
I have an Obi110 connected to a PSTN line and registed as a trunk in FreePBX.  Everything rings and connects correctly but DTMF tones are not being passed through to my FreePBX IVR.  I have tried changing the DTMF settings in the ITSP profile to auto, inband, and RFC2833.  I have also togled the "X_usefixeddurationrfc" with all three.  Nothing works and no tones are passed through.  If I answer the call and the caller press keys, I DO hear VERY short chirps.  They are so short they are barely audible.

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