Look in the system options and service class there is a bit that needs to be turned on to pass DTMF I had the same issue found it in the rel 12 program manual
There was a setting in the phone itself under maintenance, i think adjust, then audio, then DTMF. It was set at 32db at default, I moved it down to 12 and haven't had a problem since. I know once you were into the phone programming, it was 3,4,1,6 then i entered 12.
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