Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 366)

366 Chapter 42 VoIP overview

NN40020-603NN40020-603

Codecs with Silence Suppression, also referred to as VAD (Voice Activity Detection), make VAD

active on the system, which performs the same function as having silence suppression active. Also

refer to “Silence suppression” on page 529.

Proactive Voice Quality Management (PVQM)

Proactive Voice Quality Monitoring (PVQM) provides real-time notification in case of voice over

IP call quality degradation, thus allowing you to monitor and manage calls on the network in real

time. As a result, you can be aware of, and respond to, changing network conditions in a proactive

way.

PVQM monitors a set of metrics which include:

• packet loss

• inter arrival jitter

• round trip delay

• Listening R

These metrics and supplementary information provide you with valuable insight into the real time

quality of the call from the end-user perspective. This information gives an indication of the type

of problem, and can be used to locate the source of the issue, thus accelerating the isolation and

diagnostics phase of problem resolution.

In addition to packet loss, inter arrival jitter and round trip delay, PVQM monitors the “listening

R” value. The R-Factor, as defined by ITU G.107 and IETF 3611, is a call quality index that

assesses network impairments such as packet drops, jitter and round trip delay with consideration

for the burstiness and recency of these impairments. The Listening R metric provides you with

definitive answers about the actual QoS delivered to the telephone user. With this metric, you see

the raw data (such as jitter or packet drop rate), and a summary of the effect of the data on the

quality experienced by the user.

For example, a Warning Threshold for the listening R-value might be set at 80. When voice quality

drops below this value as measured at the telephone set itself, an event is generated. The event

notification is augmented with other valuable state information, such as network loss rate, average

rate of discards due to jitter, average length of bursts, and presented as an alarm. Analysis of the

alarms and supplementary information in the alarm description helps you identify and troubleshoot

voice quality issues and proactively initiate responsive actions.

Refer to the Administration Guide (NN40020-600) for information on how to configure and use

PVQM functionality.

Note: You can only change the codec on a configured IP telephone if it

is online to the BCM, or if Keep DN Alive is enabled for an offline

telephone.

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Avaya BCM50 Konfigurationsanleitung Seite 366