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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 9 Customizing the Cisco Unified IP Phone
Configuring Wideband Codec
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 9-4 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 re-enable the Enable Caching of Constant and Bin Files at Startup TFTP service parameter
(located in the Advanced Service Parameters).
Configuring Wideband Codec
If Cisco Unified Communications Manager has been configured to use G.722 (G.722 is enabled by
default for the Cisco Unified IP Phone 8961, 9951, and 9971) and if the far endpoint supports G.722, the
call connects by 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.
Two parameters in Cisco Unified Communications Manager Administration affect whether wideband is
supported for this Cisco Unified Communications Manager server and/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 Models 9971 that are registered to this Cisco Unified
Communications Manager will 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 will choose that codec for the call when possible.
• Advertise G.722 Codec—From Cisco Unified Communications Manager Administration, choose
Device > Phone. The default value of this product-specific parameter is to use the value specified
in the enterprise parameter. If you want to override this on a per-phone basis, choose Enabled or
Disabled in the Advertise G.722 Codec parameter on the Product Specific Configuration area of the
Phone Configuration window.