I have multiple CUCM clusters with multiple Expressway in different regions of the world. At the moment when a Jabber user from external does a directory lookup they only see users in the home cluster because of UDS and the directory is limited to each region. My question is if I enable ILS (Intercluster lookup service) between the cluster will the Jabber users be able to see all the users in other regions. I do have all the IMP servers peering to each other. Internally Jabber users can see all users from other regions.
Jaime is correct (+5), easiest solution is to simply add additional LDAP syncs to each cluster that will bring users from other domains/forests into each cluster so that you can find all of the contacts. You will want to ensure users on their own cluster have the Home Cluster checkbox checked in order for ILS to work correctly.
As Jaimie mentioned in latest versions of CUCM, Expressway Cisco introduced Cisco Directory Integration (CDI):
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.