/mcpILS Interaction In Cisco Unified CM Administration, you can configure ILS on a pair of clusters and then join those clusters to form an ILS network. Once you have established the ILS network, you can join additional clusters to the network without having to configure the connections between each cluster. Whenever Extension Mobility login or logout occurs, ILS sync starts to update the available information to other clusters. Configuring user as superuser automatically initiates the ILS sync irrespective of Directory Number configuration for ILS. Note For more information, see the Configure Intercluster Lookup Service chapter in the System Configuration Guide for Cisco Unified Communications Manager at https://www.cisco.com/c/en/us/support/ unified-communications/unified-communications-manager-callmanager/ products-installation-and-configuration-guides-list.html. Extension Mobility Roaming Across Clusters Task Flow Procedure Purpose Command or Action Generate a report to identify devices that support the Extension Mobility feature. Generate a Phone Feature List, on page 5 Step 1 Configure Extension Mobility to allow users to temporarily access their phone settings, such as Configure Extension Mobility by completing, the following subtasks in order: Step 2 line appearances, services, and speed dials, from • Activate Extension Mobility Services, on page 405 other phones when they login from remote cluster. Perform this task flow on both home • Configure the Cisco Extension Mobility Phone Service, on page 406 and remote clusters, so that users will be able to access settings from either a home or remote cluster. • Create an Extension Mobility Device Profile for Users, on page 407 • Associate a Device Profile to a User, on page 407 • Subscribe to Extension Mobility, on page 408 Use this procedure to give Extension Mobility users the ability to roam between different Configure Roaming for Extension Mobility Users, on page 461 Step 3 clusters in an ILS network, while using the same login credentials. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 457 Receiving Calls ILS Interaction