We are now into our final blog on VoIP reporting in NetFlow Analyzer. Do check out the last blogs from here and here to know on VoIP reporting and adding VoIP monitors. This blog will guide you on the reporting features in NetFlow Analyzer after creating VoIP monitors. The parameters measured by VoIP include Jitter, Latency, Packet Loss and MOS.
Jitter:
Jitter indicates a variation in delay between arriving packets (inter-packet delay variance). Users often experience uneven gaps in speech pattern of the person talking on the other end, and sometimes there are disturbing sounds over a conversation coupled with loss of synchronization etc.
Latency:
The delay measured is the time taken for a caller’s voice at the source site to reach the other caller at the destination site is called as latency. Network latency contributes to delay in voice transmission, resulting in huge gaps between the conversation and interruptions.
Packet Loss :
Packet loss is a measure of the data lost during transmission from one resource to another in a network. Packets are discarded often due to network latency.
MOS:
The jitter codec determines the quality of VoIP traffic and each codec provides a certain quality of speech. The Mean Opinion Score is a standard for measuring voice codecs and is measured in the scale of 1 to 5 (poor quality to perfect quality). The quality of transmitted speech is a subjective response of the listener.
Overview Report:
This 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 call path reports:
These reports shows you the top 10 call paths by MOS, packet loss, jitter and latency.
All Monitor Report :
This report show the path, MOS, RTT, latency, jitter and packet loss details for each of the monitors present. These values are updated at each SNMP poll done on the router. based on the results of polling, the availability and next poll time is also shown. Each monitor displayed in the “All monitors” report can be drilled down to display the report which is shown. 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.
With such easy to understand reports and a combined view with NetFlow data, you can now know when the quality is bad as well as find the cause for the poor quality.
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Regards,
Praveen Kumar
