How To Upgrade Cisco Call Manager Cluster

I upgrade my CUCM cluster of a publisher and subscriber from version 12.5 to 14. Audio issues with first attemmpt, so this is a redo 00:00 Intro 01:34 Make sure you have the correct resources 01:56 How to change the VM specs 03:22 Get SFTP server ready 04:31 allow through firewall 05:31 Log into CLI and check version and disk space 06:56 upload and install COP files 09:45 upload and install the ISO 10:19 verify installation success 10:53 upgrade subscriber 12:55 switch versions on publisher 14:34 switch version on subscriber 15:00 verify success 14:45 install new RTMT CUCM 14 files: https://software.cisco.com/download/h... ciscocm.enable-sha512sum-2021-signing-key-v1.0.cop.sgn ciscocm.preUpgradeCheck-00029.k4.cop.sha512 UCSInstall_UCOS_14.0.1.11900-132.sha512.iso Virtualization Requirements: https://www.cisco.com/c/dam/en/us/td/... SFTP server: https://www.solarwinds.com/free-tools... Upgrade Guide from cisco: https://www.cisco.com/c/en/us/td/docs...