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The latest version 12.6 is supported by ESXi 7 https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-prime-collaboration-deployment.html#v12.6
Hello.As I see CUCM 12.5 SU2+ is supported for ESXi 7.0+ https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-unified-communications-manager.html