Hi everyone,
Can someone point me to documentation for which phones support this feature?
I see that it's been supported since CUCM 11:
"For secure configuration download, Unified Communications Manager Release 11.0 is enhanced to support HTTPS in addition to the HTTP and TFTP interfaces that were used in the earlier releases."
you would need to put your cluster in secure mode and first you need to make sure if you are running the restricted CUCM software, if not, forget it, you wont get it to run unless you rebuild the cluster with restricted software.