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42 CHAPTER 2: CONFIGURING THE CALL RECORDS SERVICE
in XML format and stored on the Accounting server in the
/opt/3com/VCX/acctxml/qos directory. You can use a third-party
application to download the QDRs and create reports.
QoS monitoring, as implemented on a VCX system, covers 3Com IP
telephones (models 310x) as endpoints. The EMS administrator can:
■ Configure one or more monitored endpoints or subnets.
■ Configure thresholds for QoS statistics generation by the phones on
those monitored subnets.
■ Configure alarm thresholds for trap notifications based on QoS
parameters.
■ View generated statistics using SNMP.
The following QoS statistics can be recorded at the end of every call for
each leg of the call. These statistics are recorded in the call history table
on the Accounting server, and available through EMS.
■ Codec Sample Size
■ SIP Call ID
■ Codec Type
■ Device Type
■ Computed Mean Opinion Score
■ Jitter
■ Packet Loss
■ Round Trip Delay
■ Call Start Time
■ Call End Time
■ Caller Extension and IP address
■ Called Party extension and IP address
In addition to call statistics, the following aggregate average statistics are
available at the endpoint or subnet level, depending on how the statistics
collection is configured. These parameters are set to default thresholds,
using EMS, on the call processor.
■ Computed Mean Opinion Score Average
■ Jitter Average