You may have the wrong phone load installed. If that is the case, you will have to correct that. IP Keyswitch and SRST require special loads. To default the phone, press **# after you power up (this unlocks the phone config) then press the settings button, 3 (network config) then 33 (erase config). Press the Yes softkey and then the Save softkey. The phone should then reboot without any configuration. If you tried that already, I would look at what phone load you have. CallManager will "upgrade" the software on any phone connected to it.