Cisco TelePresence Administrator's Manual page 382

Reference material
LDAP server configuration for device authentication
The OpenLDAP daemon (slapd) must be restarted for the TLS settings to take effect.
To configure the VCS to use TLS on the connection to the LDAP server you must upload the CA's certificate
as a trusted CA certificate. This can be done on the VCS by going to: Maintenance > Security certificates
> Trusted CA certificate.
Cisco VCS Administrator Guide (X8.1.1) Page 382 of 507