Hi,
I would like your advice on phone firmware management.
We are running a big CUCM 8.6 cluster with many site offices. The phone firmware version in device defaults is 9.3
When we order new phones, we receive phones with firmware versions less than 9.3 and greater than 9.3.
When the firmware version is less than 9.3, we dont have an issue. The phones just upgrade.
When the firmware version of the new phones is greater than 9.3, then we have had issues. Phones dont do the downgrade of the firmware from a higher version to a lower version. Does Cisco support downgrade of the phone firmware from a higher to a lower version? How do we know which version downgrades have been tested by Cisco. I dont see much info about downgrade in the release notes.
How do we manage this situation?
We dont want to add the new devices with a special load as we would like all devices in our network to have the same load.
Is upgrading the phone firmware globally on CUCM on a regular basis the only solution?
Please let me know how you manage the issue of phone firmwares on CUCM?
Many thanks for your help!!
Regards
Pete
