I have a cluster of Call Manager 3.3.2 servers. I am planning on buying a new cluster, Everyone is saying that the upgrade from 3.3.2 to 5.1 is near impossible. Is this true, I want minimal downtime, but with a new cluster of servers to port the data over to, it seems like down time could be minimized. Our configuration is not very complex, we have a large number of phones, but I am thinking that the database could be exported, data could be massaged and then the phones re-input using a BAT tool for CCM5.1 if necessary. Also I am hearing that CCM5 might not be ready for production. Can I get some feedback on this.
1. How possible is 3.3(2) upgrade to 5.1
2. Using new servers how difficult will it be.
3. If I configure the new servers by hand for most config, and then use BAT to transfer phone devices. Would this help?
4. Is CCM5.1 stable enough to use in production