Are there any licensing issues when upgrading from CUCM 6.0 to 7.0?
When we upgraded from 5.1 to 6.0 we were unable to activate the partition as there was a license issue that had to be resolved.
That is correct. The DLU's and Node Licences will be okay but you will need to purchase the Software Feature License for CUCM 7.x
Here is a clip that speaks to this issue;
Software Feature License
When you upgrade from an earlier release of Cisco Unified Communications Manager to Release 7.0(2), you must download and install a software feature license to activate the new features.
Hope this helps!