This read-write setting sets the echo cancellation threshold for this voice port, measured in 1 dB increments starting from db-12. Adjusting it changes the sensitivity at which the echo canceller acts on the line, which affects how well the port suppresses echo without clipping double-talk (both parties speaking at once). For example, if callers on this port report choppy audio during simultaneous speech, an administrator might lower the aggressiveness by adjusting this object away from its most sensitive setting.