Cisco 9971 - Set up Wideband Codec

•
Full size image: Version that appears on the on the phone.
•
Thumbnail image: Version that displays on the Background Images screen from which users can select
an image. Must be 25% of the size of the full-size image.
Many graphics programs provide a feature that resizes a graphic. An easy way to create a thumbnail image
is to first create and save the full-size image, then use the sizing feature in the graphics program to create
a version of that image that is 25% of the original size. Save the thumbnail version by using a different
name.
Tip
The PNG files for background images must meet the following requirements for proper display on the phone:
•
Full size image - 640 pixels (width) X 480 pixels (height).
•
Thumbnail image - 123 pixels (width) X 111 pixels (height).
If you are using a graphics program that supports a posterize feature for grayscale, set the number of tonal
levels per channel to 16, and the image posterizes to 16 shades of grayscale.
Tip
Set Up Wideband Codec
By default, the G.722 codec is enabled for the Cisco Unified IP Phone 8961, 9951, and 9971. If Cisco Unified
Communications Manager is configured to use G.722 and if the far endpoint supports G.722, the call connects
using the G.722 codec in place of G.711.
This situation occurs regardless of whether the user has enabled a wideband headset or wideband handset,
but if either the headset or handset is enabled, the user may notice greater audio sensitivity during the call.
Greater sensitivity means improved audio clarity but also means that the far endpoint can hear more background
noise: noise such as rustling papers or nearby conversations. Even without a wideband headset or handset,
some users may prefer the additional sensitivity of G.722 distracting. Other users may prefer the additional
sensitivity of G.722.
The Advertise G.722 Codec service parameter affects whether wideband support exists for all devices that
register with this Cisco Unified Communications Manager server or for a specific phone, depending on the
Cisco Unified Communications Manager Administration window where the parameter is configured.
Procedure
Step 1
To configure wideband support for all devices:
a) From Cisco Unified Communications Manager Administration, choose System > Enterprise Parameters
b) Set the Advertize G.722 Codec field
The default value of this enterprise parameter is True, which means that all Cisco Unified IP Phone Models
9971 that register to this Cisco Unified Communications Manager advertise G.722 to Cisco Unified
Communications Manager. If each endpoint in the attempted call supports G.722 in the capabilities set,
Cisco Unified Communications Manager chooses that codec for the call whenever possible.
Step 2
To configure wideband support for a specific device:
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
179
Set Up Wideband Codec