# HCI/CTI Telephony Operation

This feature permits communication between the host and the system, but does not provide any host application functionality. In order for this feature to operate correctly, the host computer must be equipped to do the following:

- communicate with the system under the Mitel HCI protocol

- run a suitable software application.

Related Topics

- HCI/CTI Telephony Description

- HCI/CTI Telephony Conditions

- HCI/CTI Telephony Programming