Cisco 6800 Series Maintenance Manual - Page 5

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Maintenance

Voice Quality Reporting

You can capture voice quality metrics for Voice over Internet Protocol (VoIP) sessions with a Session Initiation

Protocol (SIP) event package. Voice call quality information derived from RTP and call information from

SIP is conveyed from a User Agent (UA) in a session (reporter) to a third party (collector).

The Cisco IP phone uses User Datagram Protocol (UDP) to send a SIP PUBLISH message to a collector

server.

Supported Scenarios for Voice Quality Reporting

Currently, only the basic call scenario supports voice quality reporting. A basic call can be a peer to peer

incoming or outgoing call. The phone sends the SIP Publish message when a call ends.

Mean Opinion Scores and Codecs

The voice quality metrics use Mean Opinion Score (MOS) to rate the quality. A MOS rating of 1 is the lowest

quality; a MOS rating of 5 is the highest quality. The following table gives a description of the codecs and

MOS scores. For other codecs, the phone does not send the SIP Publish message.

Codec

G.711

(A-law

and

u-law)

G.729A

G.729AB

Configure Voice Quality Reporting

You can enable voice quality reporting on the phone with the web interface. Each extension on a phone has

a separate voice quality report. For each extension on the phone, use the corresponding Voice Quality Report

Address field to configure the generation of voice quality report.

Complexity and Description

Very low complexity.

Supports uncompressed 64

kbps digitized voice

transmission at one to ten 5

ms voice frames-per-packet.

This codec provides the

highest voice quality and

uses the most bandwidth of

any of the available codecs.

Low to medium complexity.

Contains the same reduced

complexity modifications

present in the G.729A.

MOS

A minimum value of 4.1 indicates good

voice quality.

A minimum value of 3.5 indicates good

voice quality.

A minimum value of 3.5 indicates good

voice quality.

Voice Quality Reporting

Minimum Call Duration for

Valid MOS Value

10 seconds

30 seconds

Maintenance