AudioCodes Mediant 800B - Page 328

User's Manual 328 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
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:
Figure 16-2: Threshold Crossings and Hysteresis
Table 16-1: Threshold Crossings based on Threshold and Hysteresis
Threshold Crossing Calculation
Threshold based on
Example
Green to Yellow (Minor alarm) The change occurs if the measured metric
crosses the configured Minor threshold only
(i.e., hysteresis is not used).
4
Green to Red (Major alarm) The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
2
Yellow to Red (Major alarm)
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
2
Red to Yellow (Minor alarm) The change occurs if the measured metric
crosses the configured Major threshold with
hysteresis configured for the Major threshold.
2.1 (i.e., 2 + 0.1)
Red to Green (alarm cleared) The change occurs if the measured metric
crosses the configured Minor threshold with
hysteresis configured for the Minor threshold.
4.1 (i.e., 4 + 0.1)
Yellow to Green (alarm cleared)
The change occurs if the measured metric
crosses the configured Minor threshold with
hysteresis configured for the Minor threshold.
4.1 (i.e., 4 + 0.1)
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' Session Experience Manager
(SEM) server. The SEM displays this call quality status for the associated SEM link (IP
Group, Media Realm, or Remote Media Subnet). To configure the SEM server's address,
see 'Configuring the SEM Server' on page
325.
 Depending on the crossed threshold type, you can configure the device to reject calls to the
destination IP Group or use an alternative IP Profile for the IP Group. For more information,
see 'Configuring Quality of Service Rules' on page
335.
 Alternative routing based on measured metrics. If a call is rejected because of a crossed
threshold, the device generates a SIP 806 response. You can configure this SIP response
code as a reason for alternative routing (see 'Configuring SIP Response Codes for
Alternative Routing Reasons' on page
728).