AudioCodes Mediant 500 MSBR, User Manual

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User's Manual 302 Document #: LTRT-10375
Mediant 500 MSBR
Hysteresis
hysteresis
[BWProfile_Hysteresis]
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)]
Generate Alarm
generate-alarms
[BWProfile_GenerateAlarms]
Enables the device to send an SNMP alarm if a bandwidth
threshold is crossed.

[0] Disable (default)

[1] Enable
19.4 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 690) and the device rejects a call, it searches in the IP-to-IP Routing
table for an alternative routing rule.
When the device rejects calls to an IP Group based on a Quality of Service rule, it
raises an SNMP alarm (acIpGroupNoRouteAlarm). The alarm is also raised upon a
keep-alive failure with the IP Group. For more information, refer to the
SNMP
Reference Guide .

Use a different IP Profile for the IP Group or current call. This action can be useful, for
example, when poor quality occurs due to packet loss and the device can then switch
to an IP Profile configured with a higher RTP redundancy level or lower bit-rate coder.
To learn more about which actions are supported per call metric, see the description of the
'Rule Action' parameter below.
To configure thresholds, see the following sections:

Voice Quality (MOS) - Configuring Quality of Experience Profiles on page 293

Bandwidth - Configuring Bandwidth Profiles on page 298

ASR, ACD and NER - Configuring Performance Profiles on page 859