/** The key of the configuration. e.g. x121Address */
    String LDAP_ATTR_X121_ADDRESS = "ldap.attr.x121Address";

    /** The key of the configuration. e.g. businessCategory */
    String LDAP_ATTR_BUSINESS_CATEGORY = "ldap.attr.businessCategory";

    /** The key of the configuration. e.g. registeredAddress */
    String LDAP_ATTR_REGISTERED_ADDRESS = "ldap.attr.registeredAddress";