This Integer32 counts the number of times the ComPort's voice port dropped cells due to a full queue during the current 15-minute period. Dropped voice cells manifest as audible gaps or clipped audio in a call, so this counter directly reflects congestion severe enough to actually lose voice data rather than just delay it. For example, a spike in stuVoiceChanStatsCurrDrpdCellCnt during a peak-usage evening would help explain a pattern of complaints about choppy calls specifically during that time window.