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.

Figure 9-30: VoIP MOS Forensic report
VoIP MOS Forensic report