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Wallpaper image requirements
Custom wallpaper on Control Hub
Parameters for custom wallpaper
Custom wallpaper for Cisco Wireless Phone 9821 (Control Hub)
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Add custom wallpapers to Cisco Wireless Phone 9821. This Help article is for Cisco Wireless Phone 9821 registered to Webex Calling.

Wallpaper image requirements

To get the best experience, keep the following tips in mind when choosing or designing your images:

  • Avoid using clustered images that can make it hard for you to identify phone lines on the home screen. Simplicity is key when selecting wallpapers.
  • Ensure that your chosen wallpapers match your phone's color scheme. Opt for wallpapers that complement either the dark or light color palettes. Dark images are best suited for dark mode, while light images work well for light mode.
  • Avoid using high contrast images as wallpapers. The extreme contrast can make it challenging to see the logo and other screen elements against the background.
  • Avoid using dynamic images as wallpapers.

See the supported image formats and dimensions in the following table.

Table 1. The specifications for wallpaper images
ImageSupported formatRecommended dimensions (pixels)Description
WallpaperBMP, GIF, JPG, JPEG, PNG, PBM, PGM, PPM, TIFF, XBM, XPM, CUR, ICO, SVG, TIF, WEBP

240 (width) x 320 (height)

Images that don't match the recommended dimensions may be scaled to fit the phone screen, which may cause the image to become distorted.
Wallpaper thumbnail

117 (width) x 117 (height)

Images that don't match the recommended dimensions may cause certain issues on the phone.

Custom wallpaper on Control Hub

You can choose a predefined system wallpaper and custom wallpaper on Control Hub.

1

From the customer view in Control Hub, go to Devices, and then select your phone.

2

Select All configurations.

3

Navigate to the User section and select Screen.

4

Configure the following parameters to customize the phone screen:

  • Appearance: Set the wallpaper for the phone's home screen and the color theme for its user interface.
  • Custom Wallpaper Download URL [1] – [10]: Specify the download URL of the custom wallpaper. The scheme can be HTTP, HTTPs, or TFTP.

For more details about these parameters, see Parameters for custom wallpaper.

5

Select Next.

6

Review your changes and select Apply.

7

Select Close to close the page.

Parameters for custom wallpaper

These parameters are available for Cisco Wireless Phone 9821 custom wallpaper.

ParameterDefaultDescription
Appearance

Default: Violet Dark

Options: Cyan Dark, Purple Dark, Blue Dark, Violet Dark, Blue Light, Violet Light, CustWallpaper <n>

Sets the wallpaper for the phone's home screen and the color theme for its user interface.

To select a custom wallpaper from the list, make sure that the relevant parameter Custom Wallpaper Download URL [n] (n represents the sequence number) is configured correctly.

Phone users can change the setting in the phone's settings menu.

Custom Wallpaper Download URL [1] – [10]EmptySpecifies the download URL of the custom wallpaper. The scheme can be HTTP, HTTPs, or TFTP.

Enter the string in this format:

serv=<URL_Address>;image=<Wallpaper_Filename>;[thumbnail=<Thumbnail_Filename>;][theme=<light/dark>;]

Where:

  • serv: The URL address of the server where the image files are stored.
  • image: The custom wallpaper image that will display on the phone screen.
  • thumbnail: The thumbnail of the specified image. If the field isn't configured or the phone fails to fetch the image, the phone will display a dark or light image instead.
  • theme: The default theme of the specified images. If the field isn't configured or is configured incorrectly, the theme will be light.

Example 1:

serv=http://10.74.51.12/wallpaper/;image=wallpaper-sun.png;thumbnail=thumbnail-sun.png;theme=dark;

Example 2:

The example shows that only the image and theme are configured in the string.

serv=http://10.74.51.12/wallpaper/;image=wallpaper-sun.png;theme=dark;

Example 3:

You can also add a subpath for image and thumbnail.

serv=http://10.74.51.12/wallpaper/;image=<Wallpaper_Subpath>/wallpaper-sun.png;thumbnail=<Thumbnail_Subpath>/thumbnail-sun.png;theme=dark;

To remove the custom wallpaper, clear the download URL and leave the field empty.

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