Several phone device series can display a company logo or customized image on the phone screen. The following table provides the parameters and device overrides to customize wallpaper images *(screensaver options indicated were applicable). Follow the steps below to customize the images.
 

Manufacturer	Model	Customization	File Format	Resolution	File Size	Override Codes
Htek	UC923/UC924/UC926	Wallpaper	.jpg	320*240	<=2MB	P8660="1" P20052="https://yourserver.com/wallpaper.jpg"
Htek	UC923/UC924/UC926	Screen Saver	.jpg	320*240	<=2MB	P8950="1" and P20051="https://yourserver.com/screensaver.jpg"
Grandstream	GXP2130	Wallpaper	.jpg	320*240	<-2MB	P2916="1" and   P2917="https://yourserver.com/wallpaper.jpg"
Grandstream	GXP2130/GXP2140/GXP2160/GXP2170/GXP2135	Wallpaper	.jpg	480*272	<500KB	P2916="1" and P2917="https://yourserver.com/wallpaper.jpg"
Grandstream	GRP2615	Wallpaper	.jpg	467*272	<500KB	P2916="1" and  P2917="https://yourserver.com/wallpaper.jpg"
SNOM	D785	Wallpaper	.jpg	320*240	<500KB	custom_bg-imageurl="https://yourserver.com/wallpaper.jpg";

 

The image that is to be downloaded from your server (must be presented in .jpg format. 500 KB or smaller, unless stated above). Enter the directory or file path of the wallpaper in the wallpaper server path field. * Note - The server path must begin with tftp:// or http:// or https://.  Also, note that the " " after the = sign is intentionally placed as part of the code that identifies the value of the phone.