[cisco-voip] CUCM 8.6 LDAP Synch Issue

[Boon]

Hi,
 We are currently experiencing a headache with LDAP synchronisation for two
of our customers with an inter-cluster link.

Here is the scenario:

   - Customer A has an LDAP synch with Customer A Active Directory. They
   use 'sAMAccountName' as the UserID attribute and have populated the
   'ipPhone' attribute for the CUCM telephone number.
   - Customer B has an LDAP synch with Customer B Active Directory. They
   use 'telephoneNumber' as the UserID attribute and have populated the
   'telephoneNumber' attribute for the CUCM telephone number.

Here is the issue:

   - Customer A also has an LDAP synch with Customer B Active Directory and
   see all customer B users by using the sAMAccountName.
   - Customer B also has an LDAP synch with Customer A Active Directory but
   cannot see any of customer A users by using the telephoneNumber.

This is obviously not going to be possible using the default CUCM LDAP
integration configuration as Customer A does not have any data in their
'telephoneNumber' attribute in AD.

My question is whether it's possible to apply some kind of workaround to
use the 'ipPhone' attribute in Customer B's CUCM LDAP integration by
applying a filter somewhere?

Unfortunately neither customer wants to make any changes to either their AD
or CUCM integration! :)

Any assistance or confirmation that it's a dead end would be appreciated.
 Thanks.
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