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Call server thresholds are applied to individual call servers. The call server thresholds are designed to create call server incidents from information in the Phone Details reports. For example, when a Registration Failures incident is reported, multiple endpoints in the Phones report have a status of Registration Failed.
The default call server threshold consists of the following metrics, each of which has its own threshold values.
The Registration Failures threshold creates an incident when devices repeatedly, but unsuccessfully, try to register with a call server. Excessive registration failures can indicate a configuration problem, a call server issue, or a network issue, such as a connectivity outage.
Excessive registration failures can indicate a security problem that can impede server performance. When an endpoint tries to register from an unauthorized address, the call server ultimately denies the request. The call server responds to every registration request. Therefore, excessive registrations consume bandwidth and tie up the call server while it tries to resolve device addresses and process requests.
For a Registration Failures incident, verify call setup performance in the Performance Overview to see whether problems with an overburdened call server caused other issues. Then review the Phones report to see whether the registration requests come from an unauthorized IP address.
Default: The default value for a Registration Failures threshold is 15 failures per reporting interval. The severity is always excessive.
The Poor Call Quality threshold is based on the Quality Report Tool (QRT), a feature of some Cisco IP telephone models. The QRT allows users to press a key to report poor call quality. When the key is pressed, the QRT collects information useful for troubleshooting the poor performance from various sources. The QRT then formats the information and sends it to its call server. The call server places the information in a call detail record.
The Poor Call Quality threshold creates an incident when a user presses the QRT key. When a Poor Call Quality incident is reported, a Phone Details Table is available from the Incidents Overview report. The Phone Details report shows call legs for the 15 minutes before the QRT key was pressed and identifies the associated telephone.
Default: The Poor Call Quality threshold is enabled by default, and its severity is always excessive.
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