When alerted to poor call quality by either an alert or a user complaint, you can easily search and filter your call detail records (CDRs) and call management records (CMRs) to isolate the affected call. Search criteria includes Call Origination and Destination (phone number, IP address, region, gateway/endpoint), Call Manager, Call Time, Call Status, and Call Quality. Search for all calls within the last 15 minutes with a critical MOS score then select the appropriate call to view call details and begin troubleshooting.
Download VNQM to search and filter call detail records from your Cisco Unified Communications Manager
Once you have isolated the affected call, you can view the specific call details including the VoIP Call Signaling, the Call Path Details and the corresponding IP SLA Operation. In the example below, jitter and latency for the call are both high and correlate with HOP 1 of the SLA Operation path. By clicking on the IP address of HOP 1, you will be presented with IP SLA operation details to begin troubleshooting potential network issues.
Download VNQM to view VoIP call details
Call paths are then correlated to an IP SLA operation path where you can view RTT, jitter, and latency. In the example below, jitter and latency both appear high indicating a potential network issue on the Cisco 3640.
Download VNQM to correlate VoIP call performance with IP SLA Operations
Alternatively, the VoIP Gateway View provides details on the performance of the gateway including Data Distribution, PRI Trunk Utilization, Top Quality Issues and Failed Calls.
Download VNQM to view call gateway details
When integrated with SolarWinds Network Performance Monitor (NPM), you can view detailed performance metrics such as CPU and memory utilization, interface status and utilization, latency, and response time of the IP SLA source device for further troubleshooting. Here you will see a high quantity of Cisco buffer misses that are causing the high latency.
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