What does the term 'interphone' refer to in air traffic control communication?

The term 'interphone' in air traffic control communication specifically refers to a system used for landline communication between controllers. This system facilitates clear and direct communication within the control tower and among different sectors, ensuring that air traffic controllers can effectively coordinate operations, share important information, and manage the flow of air traffic. The interphone system allows for immediate discussions and decision-making among controllers, which is essential in maintaining safety and efficiency in air traffic management.

In contrast, options related to dialogue with pilots generally involve radio communication rather than interphones. The method specifically designed for communication between pilots and air traffic controllers utilizes radios, making the interphone system distinct in its role. Similarly, communication exclusively between pilots or radar systems intended for navigation do not align with the definition of an interphone, which is focused on internal controller communication rather than pilot interactions or navigational aids.