I have the 6945 IP Phones (fw 9-1-1-0)they get the TFTP even they upgrade to 9-2-1-0, but after that they don't register with CUCM.
Do I need to install the enabler
to make it register??
I have successfully register 6941 with CUCM 8.6.x and I never installed the enabler. But don't know if it should be different with the 6945