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CCM ISDN - Primary Rate Interface Service

The Cisco CallManager (CCM) ISDN - Primary Rate Interface service monitors the utilization of ISDN Primary Rate Interface (PRI) trunks.

Service Type


Instances on a Device


Supported Systems/Applications

Cisco® CallManager Versions 4.x

Device Class

Server - Windows

Monitoring Probe

Windows probe

Scan Interval 15 minutes

Properties Queried and Calculations Performed

Namespace root\cimv2
WMI Class Win32_PerfRawData_CiscoCM_CiscoCallManager
WMI Property 0 PRIChannelsActive
WMI Property 1 PRISpansInService

Status Details

Status Detail


Active PRI Voice Channels

The number of active calls on the PRI trunk.

PRI Spans in Service

The number of available PRI trunk spans.

PRI Utilization (%)

A calculated percentage of the PRI utilization:

Active PRI Voice Channels * 100 / PRI Spans in Service * 23