I have a few SPA504G's with 1 SPA500S sidecar attached. None of the buttons work or light up. I'm not sure it even has power. I don't see any settings on the phone to configure the side car and nothing in the web interface of the phone.
Indicates that power is provided by the SPA504G.
Any ideas where to start looking?
button 1:14 6m11 7m12 8m13
button 9m15 10m19 11m20 12m21