AudioCodes Mediant 4000 SBC User Manual page 312

avoid false reports being sent by the device. Hysteresis is used only for threshold crossings
toward a lesser severity (i.e., from Red to Yellow, Red to Green, or Yellow to Green).
The following example is used to explain how the device considers threshold crossings.
The example is based on the MOS of a call, where the Major threshold is configured to 2,
the Minor threshold to 4 and the hysteresis for both thresholds to 0.1:
Table 16-1: Threshold Crossings based on Threshold and Hysteresis
Threshold Crossing
Green to Yellow (Minor alarm)
Green to Red (Major alarm)
Yellow to Red (Major alarm)
Red to Yellow (Minor alarm)
Red to Green (alarm cleared)
Yellow to Green (alarm
cleared)
Each time a voice metric threshold is crossed (i.e., color changes), the device can do the
following depending on configuration:

Report the change in the measured metrics to AudioCodes' One Voice Operations
Center (OVOC) server. The OVOC displays this call quality status for the associated
OVOC link (IP Group, Media Realm, or Remote Media Subnet). To configure the
OVOC server's address, see ''Configuring the OVOC Server'' on page 309.

Depending on the crossed threshold type, you can configure the device to reject calls
User's Manual
Figure 16-2: Threshold Crossings and Hysteresis
The change occurs if the measured metric
crosses the configured Minor threshold only
(i.e., hysteresis is not used).
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
The change occurs if the measured metric
crosses the configured Major threshold with
hysteresis configured for the Major
threshold.
The change occurs if the measured metric
crosses the configured Minor threshold with
hysteresis configured for the Minor
threshold.
The change occurs if the measured metric
crosses the configured Minor threshold with
hysteresis configured for the Minor
threshold.
Calculation
312
Mediant 4000 SBC
Threshold based on
Example
4
2
2
2.1 (i.e., 2 + 0.1)
4.1 (i.e., 4 + 0.1)
4.1 (i.e., 4 + 0.1)
Document #: LTRT-40203