Hello there,after successful virtualization of production env. into VM and implementationof OVA file all went fine with 9.1.2(Rest or Unrest) upgrade until almost 88% of RU upgrade.Than it failed with error Error detected in post-install phase.Iv dis...

Hello all,I have a fundamental question(s) regarding upgrade procedure of CUCM 7.x to 9.x version.1.) Can I go through upgrade directly? with no need of 8.x upgrade first2.) Does Cisco provide any valid procedure documentation for upgrade?3.) Did any...