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Issue with DTMF for TBAT

We  have noticed that something changed between ICM 7.5 and 8.5 and/or CVP  7.0 and 8.5. We have one or two situations where a call comes into the  CVP Ingress Gateway, does the normal CUSP>CVP stuff, kicks off an ICM  script and ICM immediately responds with a Label that evokes a DTMF *8  for Take-Back And Transfer.  In ICM 7.5/CVP 7.0, this worked fine even  without setting any VXML parameters or extending the RTP from the  Ingress GW to the VXML GW.  Ever since we migrated to ICM 8.5/CVP 8.5  and new IOS on the Ingress (15.0(1)M7) and VXML GWs (15.1(3)T1), the  only way we can make the TBAT work is by playing a silence.wav file via a  simple VXML app.  It seems like the new versions moved the code needed  for DTMF from the Ingress GW to the VXML GW, or something.  I’ve tried  searching Cisco.com for this issue but haven’t found anything yet. 

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