/mcpStep 2 On the LDAP Authentication page, do the following steps (For information on each field, see Help> This Page): a) Check the Use LDAP Authentication for End Users check box. b) Enter the values in all other fields. c) If you change the value of the Host Name or IP Address for Server field and if the IMAP clients are accessing Unity Connection, you need to restart the Unity Connection IMAP Server service. If other web applications are accessing Unity Connection, restart the server. d) If you uploaded SSL certificates to the Unity Connection server in the Uploading SSL Certificates on the Cisco Unity Connection 9.x Server section, check the Use SSL check box. Step 3 Select Save. Selecting the LDAP Users to Import into Unity Connection Consider the following points when importing LDAP user accounts into Unity Connection: • Before importing users into Unity Connection, check the LDAP directory that integrates with Unity Connection. • You can create up to 20 LDAP directory configurations to specify the users in the LDAP directory you want to import into Unity Connection. For each LDAP directory configuration, specify a user search base in which Unity Connection should search for user accounts. • Unity Connection imports all users that belong to the specified user search base, such as domain or Organization Unit in an LDAP directory tree. A Unity Connection server or cluster can only import LDAP data from subtrees with the same directory root, for example, from the same Active Directory forest. • After creating the LDAP directory configurations, synchronize Unity Connection data with data in the LDAP directory to import the LDAP data in to the Unity Connection server. The practical limit of users that can be imported into the Cisco Unified CM database is 120,000. The limit is not enforced by the synchronization process but importing a large numbers of LDAP users who do not become Unity Connection users. This reduces the amount of disk space available for messages and slows down the database performance causing the upgrades to take longer. Do not specify user search bases that causes more than 120,000 users to be imported into the Cisco Unified CM database during synchronization to avoid impact on Unity Connection performance. Caution You can synchronize the data of 160,000 users with LDAP directory. • Analyze the structure of your LDAP directory and determine whether you can specify five or less than five user search bases that: • Include the LDAP users that you want to import into Unity Connection. • Exclude the LDAP users that you do not want to import into Unity Connection. • Causes less than 60,000 users to be imported into the Cisco Unified CM database. System Administration Guide 154 LDAP Selecting the LDAP Users to Import into Unity Connection