What type of user interface does Avaya One-X provide?

Avaya One-X provides a unified communications client interface, which integrates various communication methods such as voice, video, messaging, and collaboration tools into a single platform. This type of interface is designed to facilitate seamless communication across different devices and networks, allowing users to manage their communications more effectively. The unified communications client enhances productivity by offering features like presence information, instant messaging, and integration with other applications, ensuring that users have all their communication tools readily accessible in one location.

In contrast, the other options do not accurately describe the capabilities of Avaya One-X. A traditional telephone interface focuses solely on voice calling, which does not encompass the broader functionalities offered by Avaya One-X. A web-based dashboard could imply a specific type of interaction that does not capture the full range of unified communications features. A text-based command line interface would lack the graphical, user-friendly aspects that a unified communications client typically provides and would not serve the same purpose in a modern communication environment.