Unified Communications Infrastructure

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Hi All, Need your advice, I have a project to upgrade CUCM 10.5 to 11.XI already have the image from Cisco Product Upgrade ToolFilename : UCSInstall_UCOS_11.5.1.13902-2.sgn.iso But the issue when I try to upgrade it, it said "No valid upgrade options...

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When configuring a new Unity Voicemail Account I receive this message : The phone number or extension has already been assigned to some other object. I understand that this means that the 10 digit number I am trying to configure as the alternate exte...

We are upgrading our core switches. During this process, the CUCM publisher and subscriber will be temporarily disconnected from the LAN network. Will this affect the CUCM cluster? Do we need to shut down the CUCM cluster servers during this time?