Cisco Phone - Registration Rejected : security error

During the installation of new Cisco phones, I received the message "Registration Rejected : security error" as soon as I connected the phone. The phone was not yet configured in the Call Manager and was on Auto Registration. There was enough extension in the pool as well.
The way that I fixed the issue was adding the phone manually into the Call Manager. Then resetting the phone and it started working.

CUBAC “database update error”

While adding the Speed Dial  numbers to your CUBAC version 3.1, you may get “database update error” error message. On Cisco website  the solution is disabling the Antivirus. If by disabling the Antivirus it still gives you the same error message, you only need to reboot your Auto Attendant Console server. The reboot will fix the issue.