User's Manual 306 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
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 668) 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 297
Bandwidth - ''Configuring Bandwidth Profiles'' on page 302
ASR, ACD and NER - ''Configuring Performance Profiles'' on page 815
Note: The section is applicable only to the SBC application.
The following procedure describes how to configure Quality of Service rules through the
Web interface. You can also configure it through ini file (QualityOfServiceRules) or CLI
(configure voip > qoe quality-of-service-rules).
To configure a Quality of Service rule:
1. Open the Quality of Service Rules table (Setup menu > Signaling & Media tab >
Media folder > Quality of Service Rules).
To Next Page
Loading...
Need help?
General
