I've just set up a UC520 with 2 SPA508Gs and 2 SPA525gs.
I'm using the Early adopter software for SPA508G compatability.
My small problem is that the SPA508Gs pick up an IP address from the data Vlan, and show as unregistered. I've set them up manually, so they have extensions, but no the right IP addressing.
Any suggestions why?