I would like to know the max limit on CUCM 12.5 for End Users (LDAP + Local).
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What causes you to state it does not increase? What makes you think it would increase? Not all limits changes with newer versions, in fact likely most do not.
The maximum number of users that a Unified CM cluster can handle is limited by the maximum size of
the internal configuration database that gets replicated between the cluster members. The maximum
number of users that can be configured or synchronized is 160,000. With more than 80,000 users the
maximum number of LDAP synchronization agreements is limited to 10, while with less than 80,000
users the total number of LDAP synchronization agreements is limited to 20