Look at these post for an idea on what you need to do.
create NEW Common Phone Profile:
a. uncheck - Enable End User Access to Phone Background Image Setting
b. clarify the path to new image - Desktops/800x480x24/test.png>>>>> only the file name test.png is enough. Apply this Common phone Profile on the phone's and restart the phone.
If you are using Common Phone profile, there is no need of List.xml.
You add customized wallpaper in one of two ways:
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Using the List file
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Using a Common Phone Profile
If you want the user to be able to select your image from various wallpapers available on the phone, then modify the List file. But if you want to push the image to the phone, then create or modify an existing Common Phone Profile.
Regardless of your approach, note the following:
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Your images must be in PNG format and the full sized image must be within the following dimensions: -
Thumbnail images—139 pixels (width) by 109 pixels (height)
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Cisco IP Phone 8800 Series—800 pixels by 480 pixels
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Cisco IP Phone 8851 and 8861 Key Expansion Module with a dual LCD screen—320 by 480 pixels
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Cisco IP Phone 8865 Key Expansion Module with a dual LCD screen—320 by 480 pixels
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Cisco IP Phone 8800 Key Expansion Module with a single LCD screen—272 by 480 pixels
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Upload the images, the thumbnails, and List file to your TFTP server. The directory is:
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Cisco IP Phone 8800 Series—Desktops/800x480x24
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Cisco IP Phone 8851 and 8861 Key Expansion Module with a dual LCD screen—Desktops/320x480x24
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Cisco IP Phone 8865 Key Expansion Module with a dual LCD screen—Desktops/320x480x24
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Cisco IP Phone 8800 Key Expansion Module with a single LCD screen—Desktops/272x480x24
After the upload is done, you restart the TFTP server.
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If you don't want the user selecting their own wallpaper, then disable Enable End User Access to Phone Background Image Setting. Save and apply the phone profile. Restart the phones so your changes take effect.
<CiscoIPPhoneImageList>
<ImageItem Image=”TFTP:Desktops/320x212x12/TN-Fountain.png” URL=”TFTP:Desktops/320x212x12/Fountain.png”/>
<ImageItem Image=”TFTP:Desktops/320x212x12/TN-FullMoon.png” URL=”TFTP:Desktops/320x212x12/FullMoon.png”/>
</CiscoIPPhoneImageList
