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Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
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Chapter 6 Customizing the Cisco Unified IP Phone
Configuring Wideband Codec
Note If the folder does not exist, the folder is created and the files are uploaded to the folder.
Step 3 You must also copy the customized images and files to the other TFTP servers that the phone may contact
to obtain these files.
Note Cisco recommends that you also store backup copies of custom image files in another location.
You can use these backup copies if the customized files are overwritten when you upgrade
Cisco Unified Communications Manager.
Step 4 Use a text editor to edit the List.xml file. See the “List.xml File Format Requirements” section on
page 6-4 for the location of this file, formatting requirements, and a sample file.
Step 5 Save your modifications and close the List.xml file.
Note When you upgrade Cisco Unified Communications Manager, a default List.xml file will replace
your customized List.xml file. After you customize the List.xml file, make a copy of the file and
store it in another location. After upgrading Cisco Unified Communications Manager, replace
the default List.xml file with your stored copy.
Step 6 To cache the new List.xml file, stop and start the TFTP service by using Cisco Unified Serviceability or
disable and reenable the Enable Caching of Constant and Bin Files at Startup TFTP service parameter
(located in the Advanced Service Parameters).
Configuring Wideband CodecIf Cisco Unified Communications Manager has been configured to use G.722 (G.722 is enabled by
default for the Cisco Unified IP Phone 7970 Series) 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 more background noise can be heard by the far endpoint—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. Other users may be distracted by the additional sensitivity of
G.722.
The following parameters in Cisco Unified Communications Manager Administration affect whether
wideband is supported for this Cisco Unified Communications Manager server or a specific phone:
• Advertise G.722 Codec—From Cisco Unified Communications Manager Administration, choose
System > Enterprise Parameters. The default value of this enterprise parameter is True, which
means that all Cisco Unified IP Phone Series that are registered 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 its capabilities set, Cisco Unified Communications
Manager chooses that codec for the call.