Wallpaper and logo 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.
  • The logo displays on the phone screen only, and it doesn't display on the KEM screen. When multiple lines are configured on Cisco Desk Phone 9841, 9851, and 9861, the logo and the logo setting in the Settings menu are unavailable.
  • To use custom wallpaper on phones with Key Expansion Modules (KEM) attached, prepare both phone wallpaper and KEM wallpaper.

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

Table 1. The specifications for wallpaper and logo images on different call control systems
ImageSupported format (Webex Calling or BroadWorks)Recommended dimensions (pixels)Description
Logo

BMP, GIF, JPG, JPEG, PNG, PBM, PGM, PPM, TIFF, XBM, XPM, CUR, ICO, SVG, TIF, WEBP

Cisco Desk Phone 9851: 190x125

Cisco Desk Phone 9861: 380x250

Cisco Desk Phone 9871: 494x325 / 418x275

Cisco Video Phone 8875: 380x250

Images that don't match the recommended dimensions will be scaled proportionally.

You don't need to create a separate thumbnail image for the logo. The system automatically scales the logo image to fit the dimensions of the thumbnail.

Wallpaper

Cisco Desk Phone 9851: 480x240

Cisco Desk Phone 9861: 800x480

Cisco Desk Phone 9871: 1280x720

Cisco Desk Phone 9800 Key Expansion Module: 480x800

Cisco Video Phone 8875: 1024x600

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

Cisco Desk Phone 9851: 100x56

Cisco Desk Phone 9861: 150x90

Cisco Desk Phone 9871: 228x128

Cisco Video Phone 8875: 180x100

Images that don't match the recommended dimensions may cause certain issues on the phone.
Due to the storage limitation on the Cisco Desk Phone 9851, make sure that the limit size (250KB x 10) is not reached. Otherwise, certain issues might occur on the phones. See the following table for details:
Table 2. Limit size of customized wallpapers
Phone ModelMaximum size per imageMaximum number of imagesLimit size
Cisco Desk Phone 9851250KB10250KB x 10
Cisco Desk Phone 98611MB201MB x 20
Cisco Desk Phone 98711MB201MB x 20
Cisco Video Phone 88751MB201MB x 20

Customize wallpaper and logo on Control Hub

You can choose a predefined system wallpaper, and customize wallpaper and logo 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] – [20]: Specify the download URL of the custom wallpaper. The scheme can be HTTP, HTTPs, or TFTP.
  • Logo Enable: Set this to Yes to enable the appearance of the logo on the phone home screen. If enabled, the date and time on the home screen will be replaced by the specified logo.
  • Logo URL: Specifies the download URL of the logo that will be displayed on the phone home screen.

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

5

Select Next.

6

Review your changes and select Apply.

7

Select Close to close the page.

Parameters for custom wallpaper and logo

These parameters are available on Cisco Desk Phone 9851, 9861, 9871, and Cisco Video Phone 8875.

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] – [20]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>;][kem=<KEM_Wallpaper_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.
  • kem: The custom wallpaper image that will display on the KEM screen. If the field isn't configured or the phone fails to fetch the image, then the KEM will use Violet Light or Violet Dark as the custom wallpaper.
  • 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;kem=kem-wallpaper-sun.png;theme=dark;

Example 2:

The example shows that only the image and theme are configured in the string. The image of thumbnail will be a dark image, and the custom wallpaper of KEM will be Violet Dark.

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

Example 3:

You can also add a subpath for the "image", "thumbnail", and "kem":

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

  • The maximum number of the custom wallpapers on Cisco Desk Phone 9851 is limited to 10. For other models (such as, 9861/9871/8875), the maximum number is 20.
  • To remove the custom wallpaper, clear the download URL and leave the field empty.

Logo EnableNo

Options: Yes, No

Enables or disables the appearance of the logo on the phone home screen. If enabled, the date and time on the home screen will be replaced by the specified logo.

Before the parameter is set to Yes, make sure that the relevant parameter Logo URL is configured correctly.

Logo URLEmptySpecifies the download URL of the logo that will be displayed on the phone home screen.

To remove the specified logo, make sure to leave the parameter empty.

Only one logo can be applied for the phones.