Make sure your multi-cluster environment has the following configured:

• DNS SRV records for Cisco Jabber Service Discovery. For instructions, see " Service Discovery" in the Cisco Jabber Planning Guide for your version of Cisco Jabber.
• Cisco Intercluster Lookup Service (ILS) between the CUCM clusters in your environment. For instructions, see "Intercluster Lookup Service" in the Cisco Unified Communications Manager Features and Services Guide for your version of Cisco Unified Communications Manager.
• Intercluster Peering between the CIMP clusters in your environment. For instructions, see " Intercluster Peer Configuration" in the Cisco Unified Communications Manager Configuration and Administration Guide for your version of the Cisco Unified Communications Manager.

Create the following users and passwords on each CUCM Publisher in each CUCM cluster in a multi-cluster environment. These must be the same, including case sensitivity on each server. BEMS uses these users and password to authenticate to the CUCM server for user Presence information.

For BlackBerry Connect: AXL application user username and password. The AXL application user must be a user that is in a group that is assigned the Standard AXL API Access role. For more information, see your Cisco documentation.

Download the required certificates from each cluster.

• Tomcat.der
• Cup.der
• Cup-xmpp.pem and Cup-xmpp-ECDSA.pem
• Cup-ECDSA.der and Tomcat-ECDSA.der
• CUCM SSL certificate. Visit the Cisco Devnet to see Download the Cisco Unified CM SSL Certificate

Import the certificates into the Java keystore. For instructions, see "Import the CA certificate into the Java certificate store" in the BEMS-Core configuration content.

Configure the BlackBerry Connect service.

Configure the BlackBerry Presence service.