Cisco Systems NAM, 5 manual Voice Call Statistics, Monitoring RTP Streams, RTP Stream Stats Details

Chapter 3 Monitoring and Analysis

Media

RTP Stream Stats Details

This table shows the per-interval stats calculated by NAM at each interval. The columns of the tables are:

•Report Time: time when the stats were calculated. This is the end time of the interval.

•Report Duration: the stream duration during the report interval.

•Worst MOS: the lowest score of the stream among 3-second MOS score. NAM internally evaluates the MOS value of the stream every 3 seconds. This is the lowest score among them.

•Average MOS: average score of the 3-second score values during the duration of the stream in the interval. This value is used in deriving the Duration Weighted MOS value in NAM.

•Jitter: variation of packet arrival time compare to the expected time.

•Actual Packet Loss percentile: percentile of packets that are not seen by NAM.

•Adjusted Packet Loss percentile: percentile of packets that include the actual packets lost an packets that had arrived too late to get into buffer prior to paying back at the endpoint.

•Concealment Seconds: number of seconds in which the NAM sees packet loss.

•Severe Concealment Seconds: number of seconds in which the NAM detected more 5 percent of packet loss.

•Packets: total packets NAM have seen for the interval.

Monitoring RTP Streams

To monitor the RTP streams, choose Analyze > Media > RTP Streams. You can also arrive at this page by:

•From the RTP Conversation table, clicking on a specific stream

•From the Call Detail window, clicking on the stream that is associated with the call On this screen, at least one of the following is required: Site, data source, or VLAN. The five charts available on this screen are:

•RTP Streams: Number of streams that fall in the quality bands of excellent, good, fair, and poor during the selected interval.

•Top N Source End Points: Endpoints that generated the lowest duration weighted MOS during the selected interval.

•Top N Destination Endpoints: Endpoints that experienced the lowest duration weighted MOS during the selected interval.

•Top N RTP streams: RTP streams that have the lowest duration weighted MOS during the selected interval.

•Top N RTP streams by Adjusted Packet Loss: RTP streams that have the highest overall adjusted packet loss percent during the selected interval.

Voice Call Statistics

To monitor voice quality, choose Analyze > Media > Voice Call Statistics. The charts will provide an overview of voice quality.

The charts available are:

	User Guide for the Cisco Network Analysis Module (NAM) Traffic Analyzer, 5.0
OL-22617-01		3-39