Unified CCX installation has the following installation options:

• Standard installation - This option allows you to install Unified CCX software from the installation disc.

• Unattended installation - This option allows you to use the installation disc and a preconfigured USB disk to install Unified CCX software unattended.

• Virtualization - Unified CCX supports installation on a virtual machine.

  Note	For more information, see the Unified CCX Virtualization related information located at: https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-unified-contact-center-express.html.

For information about system requirements, see the Unified CCX Compatibility related information located at:

https://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-express/products-device-support-tables-list.html

Note	To install VMware ESXi 6.5 or upgrade VMware ESXi 6.0 to ESXi 6.5, use the VMware File System version 5 (VMFS5).

Read the following information carefully before you proceed with the installation:

• Unified CCX can only be installed on virtual machines and not on bare metal servers.

• DNS configuration and domain fields are mandatory for Unified CCX installation. Both forward and reverse lookups are required. DNS is required for the Unified CCX Chat feature to function and for integration with ICM by hostname in Unified IP IVR.

• When you Install Unified CCX on an existing server formats the hard drive, it overwrites all existing data on the drive. It also upgrades the system BIOS, firmware, and Redundant Array of Inexpensive Disks (RAID) configuration if they are outdated.

• Ensure that you connect each Unified CCX node to an uninterruptible power supply (UPS). This protects the Unified CCX server from unexpected power failure that damages the physical media.

• All servers in a cluster must run the same release of Unified CCX. The only exception is while upgrading cluster software, during which a temporary mismatch is allowed.

• Configure the server by using a static IP address so that the server IP address remains unchanged.

• Do not attempt to perform any configuration tasks during the installation.

• The field values (namely hostname and passwords) that you enter while you are running the installation program are case-sensitive. Hostname must be in lower case and the character limit is 24 characters.

• Ensure that the administrator username is not the same as that of any end user in CUCM.

• When you insert or remove a USB drive, you might see error messages on the console similar to "sdb: assuming drive cache: write through." You can safely ignore these messages.

• Ensure that the third-party web services support TLS version 1.2 before you integrate any third-party web services.