I need some help. Hope you can advice me. I am going to upgrade de call manager from 4.2.3 version to either 7.1.5 or 8.6. I have some issues I need to know before go ahead:
-Regarding the licencing process. How are traslated the CCM DLU licenses to the current CUCM licenses?
-The current call manager is running into a 7825MDC. Due to I need to upgrade the device number to up to 1500 I have to migrate the MCS as well. Thereby I have two options:
Option 1: Deploy 7835MCS refurbished instead of the current 7825MCS and upgrade to 7.1.5 version
Option 2: Migrate to a VMWare vSphere v.5 platform (already in use) and upgrade to 8.6
In terms of upgrading steps/issues wich of these two options is easier (or less complex).
DMA will get the info and you can migrate your phones into DLUs with it, otherwise licensing (email@example.com) can assist on that matter.
There's no direct upgrade path from any Windows CCM to 8.6, you need to be in Linux first.
If you don't want a two hop upgrade then it's 7.1
7.X is not supported on VMware, 8.0(2) and above is.
If you want to go to 8.6 you need to upgrade to such version on MCS, backup and then restore on VM fresh install.
CSC has a banner with IP telephone FAQs which covers upgrades, have you already reviewed that??
Cisco Unified Communications Manager (CallManager) Frequently Asked Questions
If this helps, please rate