On a SPA525G2, any of the five line keys can be used as a Speed Dial button if it is not used as a line key (set to "Disabled").
When a button is used as a line key, its LED color can be changed or set to "off" under Voice -> Phone -> Line Key LED Pattern. However, when a line key is used as a speed dial button, those settings do not apply. The Admin Guide doesn't mention how to set the color or turn off the LED when a line key is used as a speed dial.
I would like to set the speed dial buttons' LEDs to "off" but I cannot figure out how to do this. Is it possible? If so, how is it done?