I have a CUCM 10.5.2.10000-5 and a OpenLDAP in my OpenLDAP I have the user created and working, when I synchronize the CUCM with the OpenLDAP directory only synchronize a few user, and only one user with all parameters, if I review and compre the users and all users have the same configuration and the same attributes.
Jaime, thanks for your anwser
For the OpenLDAP side I don't see any problem. We have another device synchronize with the OpenLDAP and the can see and authenticate at all users. Also, all the user is contained in the same OU, and the CUCM is looking at main domain.
User1 = Full synchronize
User2 = Partial synchronize
User3 = Non synchronize
LDAP User Search Base: dc=hiway,dc=cl
Then you definitely need to dig into the LDAP traces to see exactly why CUCM won't sync those users.