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Monitor VoIP using Cisco IPSLA and NetFlow

VoIP(Voice over Internet Protocol) is a general term for a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.

Most of the businesses are gradually migrating to VoIP technology because of its bandwidth efficiency and low cost. All communications(phone calls, faxes, voice mail, e-mail, Web conferences and more) can be treated as discrete units. VoIP runs both voice and data communications over a single network, which can significantly reduce infrastructure costs.

In VoIP based voice communication, the analog voice signal is converted to the digital format which in turn is converted into internet protocol(IP) packets. These IP packets are transmitted over the internet. The above process is exactly reversed at the receiving end.

The greatest concern for any business using VoIP for their voice communications is quality. Jitter, latency and packet loss cause a drop in the quality of the voice communication being transmitted. Hence we need to monitor VoIP to maintain the quality of the voice communications by making sure the jitter, latency and packet loss values do not exceed the threshold.

VoIP monitor reports

VoIP monitor reports

"Overview" reports

These reports show the locations and their destinations along with the jitter, latency and packet loss details. The bad call details and the top call paths by jitter, latency, MOS and packet loss are also displayed.

Top-10 VoIP Reports

"Top-10" call path reports

These reports shows you the top 10 call paths by MOS, packet loss, jitter and latency.

All VoIP Monitors Report

"All monitors" report

These reports show the path,MOS, RTT, latency, jitter and packet loss details for each of the different monitors present. These values are updated at each poll. The availability and next poll time is also shown.

All VoIP Monitors Report

"All monitors" detailed report

Each monitor displayed in the "All monitors" report can be drilled down to display the report which is shown here. These reports display the "Call path details" and the "Threshold details." The MOS, jitter, latency, RTT and packet loss details are graphically represented as bar charts and line charts.


A company based in the United States recently moved from PSTN to VoIP based technology. The network manager has been receiving lots of complaint regarding voice communication. Their staff complain of drop in quality of voice communications. The drop in quality directly reflects in the form of broken communication and talk-over effects. The network manager is not able to zero in on the source of the problem. He is suggested to try ManageEngine NetFlow Analyzer which has VoIP monitoring feature. The network manager installs ManageEngine NetFlow Analyzer to monitor the bandwidth and identify the reasons for the drop in the quality of voice communications. The monitoring tool uses Cisco's IPSLA to monitor VoIP. VoIP monitoring results in displaying data by jitter, latency, packet loss and MOS. The network manager uses ManageEngine NetFlow Analyzer VoIP monitor to view the top call performances by location. He clicks on a top call path to view the call path details and threshold details. He also views the graphical representation of MOS, jitter, latency, packet loss and round trip time of that particular call path. The network is monitored at different time intervals and the data collected. These data are used to assess the performance of the network and in troubleshooting.

Note: Reporting on VoIP is available as an Add-On. It will be available during the 30 day trial period, after which separate license has to applied for VoIP add-on.

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NetFlow Analyzer is a NetFlow, sFlow, JFLow (and more) collector and analyzing engine integrated together. NetFlow Analyzer is a software (for windows and linux), does not require any hardware probes, which can be downloaded, used in your network environment and can be evaluated for 30 days. Go through the following useful links for better understanding of how NetFlow Analyzer can help you in understanding your network traffic and bandwidth utilization.