So we recently had some phones replaced under warranty with these refurbished 7942G models.
First 4 phones, we plugged in, they loaded up and we programmed them in CUCM and everything was good. The 5th and 6th phone come up with an error "Registration Rejected: Security Error". These are using the same Ethernet cable on the same switch as the first four that had no problems.
I did a reset on them and they come up to the same error. Any chance there is something in the phone causing this that needs cleared?
Solved! Go to Solution.
Try a factory reset:
After deleting the ITL/CTL and the factory reset I am still seeing the same error.