This document describes how to configure the SPA303, SPA502G, SPA504G, SPA508G, and SPA509G phones with the web-UI and with a configuration file.
Thanks Patrick but I need the logo to PERMANENTLY feature as WALL PAPER on the display.
Hi dada olowo eyo,
The Voice tab > Phone tab > General > Select Logo: setting controls the logo that is displayed for a few seconds as the phone powers up and is described in the above document.
It looks like you're wanting the Voice tab > Phone tab > General > Select Background Picture: setting which will display as a background/wallpaper image while the phone is operational.
Keep in mind that the background will be partially obscured depending what is currently displayed on the phone during normal use.