If you hear yourself or another person twice, this means there is an echo issue. This happens if the microphone of a user picks up sound from her/his own speaker. Although Brainstork has an echo-cancellation feature minimizing this, you might still encounter this issue. 

1 - Identify the person causing the echo.

If you are hearing yourself while talking, this means one of the other users in the session is causing the echo. If other people say that they hear themselves while talking, you might be the one causing the echo. You can identify the person by asking everyone to mute themselves one by one. When the person causing the echo mutes herself/himself, the echo will be gone.

2 - Use headphones.

Using headphones solves the echo issue immediately. After identifying the person causing the echo, please ask them to use headphones.

3 - Mute the person causing the echo.

The person causing echo should mute herself/himself while not talking and unmute whenever she/he would like to join the discussion. If using headphones is not an option, you can still have an echo-free session.

4 - Lower the volume of the speakers.

Since the main cause for echo is picking up sound from own speakers, lowering the volume will also lower the echo.

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5 - Don't run two participants or moderators in the same physical room.

The microphone of one computer receives the sound from the speaker of the second computer. This creates a feedback loop which creates some kind of an echo