Upgrades from 6, 7 & 8 to 9 Best Practices

Handling an upgrade to CUCM 9.x involves wrangling with half a dozen different documents, such as the compatibility guide, supported servers matrix and the relevant version's upgrade guide. The process is made all the more complicated if you need to migrate from a physical MCS server to a virtualised install. Fortunately Cisco have written a succinct guide to the best practice for an upgrade, including physical to virtual migration: Operational Guide for Cisco Unified Communications Manager