This object specifies the power level of the low
frequency component of DTMF. The power level of the high
frequency component of DTMF is relative above or below
the value specified in object cdspDtmfPowerTwist.
If the value of cdspDtmfPowerTwist is 0, the power
level of the high frequency component as well as the low
frequency component is specified by this object.