Do not know if this has been covered, but tek support told me the network was blocking my d100 base from connection to ip office or it was a defective unit. They had walked me through resetting with the reset on the base unit itself. I realized when i took the unit back to my office that the reset button does nothing but reboot the unit. I had to get into web manager using the ip set at the the customer site. The reset button on the base is CRAP. You must go into web manager and click reboot, then choose to reboot to factory default. That is the only way to wipe it. Why it did not work the first time I installed it I don't know. But after rebooting to factory defaults it worked and my office, then again at the customer site. BE SURE to unplug the base from your poe power source after you execute the reboot from the web interface of the unit. I tried the same unit with 3 ip office systems running 9.0 and 9.1 and it linked flawlessly this way to each one.