3-38
User Guide for the Cisco Network Analysis Module (NAM) Traffic Analyzer, 5.0
OL-22617-01
Chapter 3 Monitoring and Analysis
Media
RTP Streams

Purpose

The RTP Streams window shows you three pieces of information:
RTP Stream Information
• Source IP Address and Port: IP address and UDP port of the originator of the RTP stream.
• Destination IP Address and Port: Ip address and UDP port of the receiver of the RTP stream.
• SSRC: Synchronization source number as it appeared in the RTP header of the RTP stream.
• codec: encoding decoding format of the RTP stream.
RTP Stream Stats Summary
This shows you the summary of the RTP stream for the entire duration of RTP stream.
• Duration: duration of the RTP stream. This may not be the entire duration of the stream. It depends
on the viewing time interval of the window which launched this RTP stream detail window.
• Worst / Duration Weighted / Max MOS: the lowest score among per-interval reports, the score of all
per-munite interval reports that takes duration into account, and the highest score among per-interval
reports of the stream.
Note Duration-weighted is calculated with the following formula:
SUM (per-minute-mos * duration) / SUM (duration)
• Worst / Duration Weighted / Min Jitter: the largest jitter among per-interval reports, the jitter that
takes into account of the duration of all per-interval reports, and the smallest jitter values among
per-interval reports of the stream.
Note Duration-weighted are used with the following formula:
SUM(per-interval-jitter * duration) / SUM(duration)
• Worst / Overall / Min Actual Packet Loss: Loss percent of RTP packets that are not seen by NAM
and RTP packets that arrived beyond the buffer capability of the receiving end point. This includes
the highest percentile among per-interval reports, the sum of packets loss against total packets of all
per-interval reports, and the lowest percentile loss among per-interval reports.
• Worst / Overall / Min Actual Packet Loss: Similar to above, but the percent loss only includes RTP
packets that were not seen by the NAM.
• Worst / Total / Min Concealment Seconds: Number of seconds in which NAM detected packet loss
during the duration of the stream. This includes lowest concealment seconds among per-interval
reports, total concealment seconds of the entire duration of the stream, and highest concealment
seconds among per-minute stream reports.
• Severe Concealment Seconds: Similar to above; severe condition is met when the seconds have more
than 5 percent loss.