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 some of the codecs
and MOS scores. The phone supports all codecs. For all codecs, the phone sends the SIP Publish message.
Minimum Call Duration for
Valid MOS Value
MOS
Complexity and Description
Codec
10 seconds
A minimum value of 4.1 indicates good
voice quality.
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.
G.711
(A-law
and
u-law)
30 seconds
A minimum value of 3.5 indicates good
voice quality.
Low to medium complexity.
G.729A
30 seconds
A minimum value of 3.5 indicates good
voice quality.
Contains the same reduced
complexity modifications
present in the 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.
Procedure
Step 1
On the Phone Web page, select
Admin Login
>
advanced
>
Voice
>
Ext x
.
Where:
• Ext x = the extension number on the phone
Step 2
In
SIP Settings
, enter a value in the
Voice Quality Report Address x
field. You can enter either a domain
name or an IP address in this field.
You can also add a port number along with the domain name or an IP address in this field. If you do not enter
a port number, the value of the
SIP UDP Port
(5060) is used by default. If the collector server URL parameter
is blank, a SIP PUBLISH message is not sent out.
Step 3
Click
Submit All Changes
.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
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Cisco IP Phone Troubleshooting
Mean Opinion Scores and Codecs