No idea. I'm still sticking with a routing issue, that's what the Discovering message means.
What are:
IP address of the phone?
Subnet mask of the phone?
Gateway of the phone?
IP address of the TFTP server?
IP address of the system?
Subnet mask of the system?
And/or....plug the phone directly in to the IP Office, nothing else on the network except for it and a Manager PC. If you're a reseller try it on a default system in the lab, use DHCP.