I have upgraded a CUCM from 4.2 to 6.1 using the DMA tool in the lab an I am about to add the first subscriber. When I look at the Server name under System>Server on the Publisher, it has the name of the subscriber, not the IP address. I am not running DNS in the 6.1 environment so can I change the Server name to an IP address before upgrading the subscriber? I am using new hardware for the 6.1 upgrade.
You can change that if you want. I believe if you select DNS during the install, it changes the server name from IP to name. But you can change it after you get the cluster up and running. You will probably need to update the Enterprise parameters for Services as well. When phones hit the Services button and do not have DNS, it will bomb out.