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>        Yes the amount of processing power to decide the DTMF tone is
>"smallish", however, the external ADC is excessive, and on top of that we
>have only a 20mS period in which to decide what DTMF tone it is! (Worst
>case), with levels down to -26dBmO

???  DTMF dialing is speced at 10 dps, which is usually implemented as 50mS
on, 50mS off.  I've not seen any decoders that work reliably with less than
40mS



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