To install CUCM 12.5, follow the Cisco-provided installation guide.
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If you need to download the or apply a software update, here is the official path and what you should know. To install CUCM 12.5
You cannot download CUCM from a public mirror. You must have:
Do not use the default “thin provisioning” on the data disk – convert to thick eager zeroed for performance. The updated ISO will still warn you if misconfigured.
Cisco regularly releases to provide security patches and minor feature enhancements.