Configuring Wideband Codec
Note
Use a text editor to edit the List.xml file. See the
Step 4
page 6-4
Save your modifications and close the List.xml file.
Step 5
Note
To cache the new List.xml file, stop and start the TFTP service by using Cisco Unified Serviceability or
Step 6
disable and reenable 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 7975G) 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.
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:
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Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
6-6
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.
for the location of this file, formatting requirements, and a sample file.
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.
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.
Advertise G.722 Codec—From Cisco Unified Communications Manager Administration, choose
Device > Phone. The default value for this product-specific parameter is the value that is 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.
Chapter 6
Customizing the Cisco Unified IP Phone
"List.xml File Format Requirements" section on
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