The echo may potentially be coming from:
-a fellow interpreter on ICP who is not using a headset
-a fellow interpreter on ICP who is sending the audio into the computer loudspeaker instead of into the headset
-you’re listening to the same interpreter in your main RSI event and in ICP. To resolve this, click “Mute Boothmates” button in InterStar ICP or switch to a different language channel in your main RSI event.
-A participant/speaker in the main RSI event is not using a headset