The Intercluster Lookup Service (ILS) runs on a cluster-wide basis. ILS allows you to create networks of remote Cisco Cisco Unified Communications Manager clusters. The ILS cluster discovery feature allows Cisco Cisco Unified Communications Manager to connect to remote clusters without the need for an administrator having to manually configure connections between each cluster. The ILS Global Dial Plan Replication feature enables clusters in the ILS network with the ability to exchange global dial plan data with the other clusters in an ILS network.
ILS can be activated from the ILS Configuration window that can be accessed in Cisco Cisco Unified Communications Manager Administration by selecting .