VoIP MOS Forensic report
VoIP MOS Forensic report overview
The VoIP MOS Forensic report shows application-level VoIP MOS metrics.
Use cases
Troubleshooting—Use the report to perform root-cause analysis of VoIP call quality issues for an application.
Error case
Because the report output involves a crosstab-based-horizontally growing table, running the report without narrowing down the data using input controls can lead to a report showing partial results (not showing data for all intervals in the selected reporting period). This is caused by the configured limit for crosstab components in this report.
If this occurs, re-run the report narrowing down the input control values; for example, instead of selecting all metrics available to report on, select a subset. Similarly, select a subset of applications, source and destination IP groups to report on.
Caution: Changing the configured limit causes performance issues. To change the configured limit, contact Nokia technical support.
Report characteristics
The following table lists the principal report characteristics.
Table 9-13: VoIP MOS Forensic report characteristics
Characteristic |
Value |
Statistics type |
AA Cflowd RTP voice performance application |
NSP Flow Collector required |
Yes |
Domains |
Residential / Wi-Fi (ESM)
Mobile
Wi-Fi (DSM)
Business |
Report inputs |
Prompt |
Notes |
Start date |
Calendar date or relative date (for example, two days ago) and time |
Granularity |
Read-only: Raw collection only |
Report range |
Length of time to be reported, in minutes (minutes, min), hours (hours, h), days (days, d), weeks (w), or months (months, m) |
Group/Partition |
Search using partial names or wildcard (%). |
Application |
Source IP Group |
Destination IP Group |
Node Type |
Search using partial names or wildcard (%).
Select individual items or click Select All. |
Node |
Metrics |
Average burst length (msec)
Average round trip packet delay
Average voice bandwidth
Burst count Degradation factor due to:
-
codec
-
delay
-
echo
-
noise level
-
packet discard
-
packet loss
-
recency
-
signal level |
Discard packets
Flow duration
Flow start timestamp
Gap count
Lost packets MOS:
-
conversational quality
-
listening quality
-
nominal
-
reference
Mean absolute packet delay variation
Out of sequence packets
Payload type |
R-factor:
-
conversational quality
-
for burst conditions
-
for gap conditions
-
G.107
-
listening quality
-
nominal
RTP average gap length (msec)
Received packets |
Drill-down support |
No |
Example
The following figure shows a report example.