Send the following on WhatsApp
Continue to ChatChecklist - CUCM Upgrade 11.5 to 12.5.x https://lalitblogsite.com/checklist-cucm-upgrade-11-5-to-12-5-x/
Checklist - CUCM Upgrade 11.5 to 12.5.x https://lalitblogsite.com/checklist-cucm-upgrade-11-5-to-12-5-x/