This sets the negative-twist value applied when the low-frequency signaling component's power is configured relatively higher than the high-frequency component, for incoming calls. Power twist between the two tones is a known factor affecting detector reliability on real trunk lines with frequency-dependent attenuation, so this object lets an admin compensate for a specific line's tendency to attenuate one frequency more than the other. On a trunk where cable characteristics attenuate the high-frequency tone more than the low, an admin might configure a negative twist value here to pre-compensate, keeping both tones arriving at comparable power at the far end.