This read-only Counter32 counts total PCM payload octets dropped due to buffer overflow at this POTS port, excluding octets already substituted by filler due to late arrival. It is the counterpart metric to the filler-octet counter, flagging the opposite jitter-buffer failure mode of overflow rather than underflow. If this counter rises while filler octets stay low, the admin would suspect the playout buffer is too shallow for bursts of early-arriving packets on this port.