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Causes of an echo:
Echo is generally caused by the received audio from a participant being picked up by the microphone of that same participant or another device or participant in that same room.

To minimize echo in a conference:

• Mute all lines in the conference, then unmute only those participants that need to speak.

• Mute all participants in the conference.
• Unmute each participant, one at a time; then talk and listen if any echo from that location.
• Once the echo source is found, apply the corrective suggestions below.

• Try lowering the audio output level from your speakers.
• Try playing the audio from the conference through your headset earphones rather than through desktop speakers. For best results, high-quality headphones with integrated microphones are recommended. Set the audio output at a reasonable level.
• Try moving your microphone or headset further away from your speakers.
• Within a room, it is recommended that the microphone/s and speaker/s of one device be used. In that room, mute all other microphone and speaker elements from co-located devices such as laptops that joined that same meeting.
• If within the room there is a strong background noise either from an audio masking noise generator or from say, a fan, please proceed as follows. For the audio masking noise generator, please reduce its level output. For say a fan, as possible please move the microphone to a more distant location from that noise source.