Duration of voice playout from data received on time for
this call. This plus the durations for the GapFills in the
following entries gives the Total Voice Playout Duration
for Active Voice.
This does not include duration for which no data was sent by the
Transmit end as voice signal, e.g., silence suppression
and fax signal. The On Time Playout Rate can be computed
by dividing this entry by the Total Voice Playout Duration.
This counter object will lock at the maximum value which
is approximately two days.