Call tune is a term used to describe a specific melody or set of notes used as a ringtone or caller tune on a mobile phone. Antonyms for this word could include phrases such as "silence", "mute", or "quiet". These words describe a lack of sound or noise, and represent the opposite of a call tune which is meant to be heard. Other antonyms could include "chaos", "disorder", or "cacophony". Such phrases describe a state where multiple sounds are present at once, leading to a lack of order or harmony. By contrast, a call tune represents a single, clear melody meant to capture the listener's attention.