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CCM ISDN - T1 Trunks Service

The Cisco CallManager (CCM) ISDN - T1 Trunks service monitors the utilization of T1 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
WMI Property 2 T1ChannelsActive
WMI Property 3 T1SpansInService
WMI Property 4 BRIChannelsActive
WMI Property 5 BRISpansInService
Scandetail.2.Recipe $prichannelsactive 100 * $prispansinservice 23 * /
Scandetail.8.Recipe $brichannelsactive 100 * $brispansinservice 2 * /

Status Details

Status Detail


Active T1 CAS Voice Channels

The number of active calls on the T1 trunk.

T1 CAS Spans in Service

The number of available T1 trunk spans.

T1 Utilization (%)

A calculated percentage of the T1 utilization:

Active T1 CAS Voice Channels * 100 / T1 CAS Spans in Service * 24