Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 400)

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400 Chapter 43 VoIP overview

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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 703.

Proactive Voice Quality Management (PVQM)

Proactive Voice Quality Monitoring (PVQM) provides real-time notification in case of VoIP call

quality degradation. This notification allows you to monitor and manage calls on the network in

the real time.

PVQM monitors a set of metrics including packet loss, inter arrival jitter, round trip delay and

Listening R. These metrics and supplementary information provide you with valuable insight into

the real time quality of the call from the perspective of the end-user. This information can give an

indication of the type of problem; this information can then 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 can 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 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 BCM 4.0 Administration Guide (N0060598) 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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