jitsi_app_c0/react/features/base/participants/sounds.js

/**
 * The name of the bundled sound file which will be played when new participant
 * joins the conference.
 */
export const PARTICIPANT_JOINED_FILE = 'joined.wav';

/**
 * The name of the bundled sound file which will be played when any participant
 * leaves the conference.
 */
export const PARTICIPANT_LEFT_FILE = 'left.wav';