Step 1 Create two PNG files for each image (a full size version and a thumbnail version). Ensure the PNG files comply with the format guidelines that are listed in the "PNG File Requirements for Custom Background Images" section.
Step 2 Upload the new PNG files that you created to the following subdirectory in the TFTP server for the Cisco Unified Communications Manager:
To upload the files, choose Software Upgrades > Upload TFTP Server File in Cisco Unified Communications Operating System Administration
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
Step 4 Use a text editor to edit the List.xml file. See the "List.xml File Format Requirements" section for the location of this file, formatting requirements, and a sample file.
Step 5 Save your modifications and close the List.xml file.
Step 6 To cache the new List.xml file, stop and start the TFTP service by using Cisco Unified Communications Manager 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).
This is for the 7941 and 7961 models but other guides are available and follow the same basic steps. As found in this useful guide:
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