This is the power of the higher DTMF frequency signal at the time of detection. It is
specified in dB (Decibels). The 0dB power level is referenced to full scale sin(x) 16 bit PCM.
Namespace:
LanScapeAssembly: LMEVoipManaged (in LMEVoipManaged.dll) Version: 6.0.5226.26700