Guys,
I ran into an issue where we had several 6930 phones that came up fine originally, or so we thought, and after a few days they started rebooting continuously. The issue was the phones came at Main Version 1.0.0.125 and had to be manually upgraded to 1.0.0.148 before they would download and install the firmware from the controller; Main Version 1.1.0.151.
You can go to the KB and get the software needed to upgrade the phones.
Thanks,
TE