Cisco Unified Communications Manager gives users with a supported endpoint the ability to place calls to alphanumeric URIs such as firstname.lastname@example.org. The simplest way to route directory URI calls from a supported endpoint on Cisco Unified Communications Manager to an endpoint on a Cisco TelePresence Video Communications Server (VCS) or a third party call control system is to configure a domain-based SIP route pattern. For example, you can configure a SIP route pattern of acme.com to route calls addressed to the acme.com domain out a SIP trunk that is configured for the Cisco TelePresence VCS or a third party call control system.
In situations where you have more than one Cisco TelePresence VCS or third party call control systems that use the same domain name, Cisco Unified Communications Manager can use the Intercluster Lookup Service (ILS) to provide URI dialing interoperability. For each Cisco TelePresence VCS, or third party system, you must manually create a csv file with the directory URIs that are registered to that call control system.
On a Cisco Unified Communications Manager cluster that is set up as a hub cluster in an ILS network, you can create an Imported directory URI catalog for each Cisco TelePresence VCS, or third party system, and assign a unique route string for each catalog. After you import the csv files into their corresponding Imported directory URI catalog, ILS replicates the imported directory URI catalog and route string to the other clusters in the ILS network.
On each Cisco Unified Communications Manager cluster, configure SIP Route Patterns that match the route string assigned to each Imported directory URI catalog in order to allow Cisco Unified Communications Manager to route directory URIs to an outbound trunk that is destined for the Cisco TelePresence VCS or third party system.
For more information on how to import directory URIs from a VCS into Cisco Unified Communications Manager, see the "Import directory URIs from a non-ILS system" procedure in the Global Dial Plan Replication chapter of the Cisco Unified Communications Manager Features and Services Guide.
Cisco Unified Communications Manager also provides directory URI export functionality. You can export all directory URIs that were configured in the local cluster, including those that were imported from an LDAP directory, to a csv file that you can import into the other call control system. For more information on how to export directory URIs from Cisco Unified Communications Manager to a csv file, see the "Export Local Directory URIs to a CSV File" section in the Directory URIs chapter of the Cisco Unified Communications Manager Bulk Administration Guide.