[Asterisk-Users] Customer's voice not compatible with service?

[Matt]

We are using SPA-2002s and PAP2Ts to service our VoIP customers.

It seems that one of our customers (female) has a voice that is just
right that it generates DTMF tones when she talks... I know I've seen
this sporatically, but this seems to happen often on her line, and I'm
curious if there are any settings on the device to alter this
behaviour?