David....
At the moment I'm using my SPA2102...quite similar except for some fields, to the PAP2.
I mirrored the settings from my provisioned PAP2T.
I see that the DTMF is set for auto-strict
DTMF process info=yes
DTMF process AVT=yes
DTMF strict holdoff time=90
With these settings on both boxes, I hear no tones and haven't yet had a problem with interactive.
Perhaps ask support to take a look and try these settings for you if they're not already like this.
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