The adVqmCallHistory table provides detail voice quality statistics
on completed RTP voice streams. A voice call will typically have
two entries in this table one for each RTP stream. A combination
of Source IP Address and Port, Destination IP Address and Port,
and SSRC (synchronization source ID) are necessary to uniquely
identify the call session.
One management option is to configure VQM to only save call history
information for poor quality calls that exceed threshold limits.
Threshold limit settings are available for MOS scores and packet
statistics for loss, out-of-order, and jitter. Setting the maximum
call history buffer size to a lower value (default is 100 streams)
can reduce the amount of data transfer to the NMS during a
SNMP query.