Nortel Networks NN43001-314 - Manual (Page 188)

188 Planning and management
The identifying digits in the main office Call Server’s CDR log are the
manipulated string as specified by the Branch Office zone. For example,
the Branch Office user dialed "9, 555-1212", but the main office Call
Server changes it to "6, 1-613-555-1212". CDR records the dial string as
"1-613-555-1212". In other words, the main office Call Server produces a
CDR record indicating that the user dialed a "long-distance" digit string
because the feature converts the call from a local dialing pattern to a
long-distance dialing pattern.
Proactive Voice Quality management
Proactive Voice Quality management (PVQ) allows the user to monitor the
voice quality of Voice over Internet Protocol (VoIP) calls on an ongoing basis
and detect specific problems when they occur. Alarms and traffic reports
are used to implement this. Refer to Converging the Data Network with VoIP
Fundamentals (NN43001-260) for full details on this feature.
Four metrics on voice quality are collected on every call: packet loss,
latency, jitter, and R-value. The metrics are then analyzed to determine if an
alarm should be generated. The metrics are also aggregated and reported,
along with other information, in Traffic Report 16.
The R-level metric is calculated only for those IP Phones that are equipped
with a firmware version of 2.0 or higher.
A PVQ alarm is generated whenever a metric exceeds a given threshold.
The thresholds are user-defined in LD 117 at a Call Server and are
propagated throughout the system. Listed in order of increasing severity, the
threshold levels are: good, warning, and unacceptable. Refer to Converging
the Data Network with VoIP Fundamentals (NN43001-260) for details on
setting the PVQ thresholds.
A PVQ alarm can be one of two types:
• Alarms generated on a per-zone basis (zone-based) — generated if
the aggregate metrics for a particular zone, such as a Branch Office,
exceeds a warning or unacceptable threshold. These alarms are
generated by the Call Server.
• Alarms generated on a per-call basis — each call is monitored and
an alarm generated if any metric meets or exceeds a warning or
unacceptable threshold. These alarms are generated by the Signaling
Server.
The user can set a Notification Level to control when and how often a
given alarm is generated. This capability is useful when many alarms are
generated, but most are minor and relate more to potential system capacity
issues than voice quality. It is also useful when a user wants to monitor a
particular area of a network, such as a Branch Office. Notification levels
are defined in LD 117. See
"Change/print PVQ notification levels" (page
357) for the commands.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.