Can i have an independent presence deployment to be used for only IM session without the need for any CUCM?
Do we have any guides / references for the same
The CUP cannot sync directly to LDAP for its user Database. The LDAP server in CUP is used for searching for contacts in CUPC. The user database still needs to be pulled from CUCM. The CUCM itself can sync its user database from LDAP.
Yes you still need License for the users (DLU) on the CUCM side.