Licensing for CUCM is now based on the number of users and not anymore on DLU.
I think this is for CUCM 8.5.
In the Dynamic Configuration Tool, start with the “top-level” part number CUCM-USR-LIC.
Determine appropriate number of user licenses according to tables below. There is a minimum order quantity of fifty
(50) Enhanced or Basic IP Users for User Connect Licensing. User Connect Licensing for the following categories of
users are added at this step:
a. IP Users (Enhanced or Basic)
b. Essential Users (also Application-Only Users)
c. Public-Space Users
d. Mobility Users (Unified Mobility, aka Mobile Connect, also known as Single Number Reach (SNR))
e. Video Users
The number 300 should represent the number of Users.