Configuring Quality Of Service Rules - AudioCodes Mediant 800B User Manual

User's Manual
Parameter
Minor Threshold
minor-threshold
[BWProfile_MinorThreshold]
Hysteresis
hysteresis
[BWProfile_Hysteresis]
Generate Alarm
generate-alarms
[BWProfile_GenerateAlarms]
16.4

Configuring Quality of Service Rules

The Quality of Service Rules table lets you configure up to 510 Quality of Service rules. A Quality
of Service rule defines an action to perform when the threshold (major or minor) of a specific
performance monitoring call metric is crossed for a specific IP Group. The call metric can be voice
quality (i.e., MOS), bandwidth, Answer-seizure ratio (ASR), Network Effectiveness Ratio (NER),
or Average Call Duration (ACD).
Depending on the call metric, you can configure the following actions to be performed if the
threshold is crossed:

Reject calls to the IP Group for a user-defined duration.
Rejection of calls can also trigger alternative routing. When the device rejects a call due to
an ASR, NER or ACD threshold crossing, it generates the SIP response code, 850
(Signaling Limits Exceeded). When the device rejects a call due to Voice Quality and
Bandwidth threshold crossing, it generates the SIP response code, 806 (Media Limits
Exceeded). If you configure these SIP response codes in the Alternative Routing Reasons
table (see 'Configuring SIP Response Codes for Alternative Routing Reasons' on page 728)
and the device rejects a call, it searches in the IP-to-IP Routing table for an alternative
routing rule.
Version 7.2
Defines the Minor threshold value, which is the lower threshold
located between the Yellow and Green states. The parameter is
configured as a percentage of the major (total) bandwidth threshold
(configured by the above bandwidth parameters). For example, if you
configure the parameter to 50 and the 'Egress Audio Bandwidth'
parameter to 64,000, the Minor threshold for outgoing audio
bandwidth is 32,000 (i.e., 50% of 64,000).
To consider a threshold crossing:

Increase in severity (i.e., Green to Yellow): Only this value is
used.

Decrease in severity (Red to Green, or Yellow to Green): This
value is used with the hysteresis, configured by the 'Hysteresis'
parameter (see below).
Note: The parameter applies to all your configured bandwidths.
Defines the amount of fluctuation (hysteresis) from the configured
bandwidth threshold in order for the threshold to be considered as
crossed (i.e., avoids false reports of threshold crossings). The
hysteresis is used only to determine threshold crossings when
severity is reduced (i.e., from Red to Yellow, Yellow to Green, or Red
to Green). The parameter is configured as a percentage of the Major
(total) bandwidth threshold.
For example, if you configure the parameter to 10 and the 'Egress
Audio Bandwidth' parameter to 64,000, the hysteresis is 6,400 (10%
of 64,000) and threshold crossings are considered at the following
bandwidths:

Red-to-Yellow (Yellow-Minor alarm severity): 57,600 Kbps [64,000
- (10% x 64,000)]

Yellow-to-Green (Green-alarm cleared): 25,600 Kbps [32,000 -
(10% x 64,000)]
Enables the device to send an SNMP alarm if a bandwidth threshold
is crossed.

[0] Disable (default)

[1] Enable
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16. Quality of Experience
Description
Mediant 800B Gateway & E-SBC