Causes of an echo:

• A participant has both the computer and telephone audio active.
• The speakers on participants' computers or telephones are too close to each other.
• There are multiple computers with active audio in the same conference room.
• The audio is playing through your speakers/ mobile device into your microphone.

To minimize echo in a conference:

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

To identify the source of echo:

• 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.

To correct an echo problem – recommendations apply to any device type:

• 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.

The following steps apply if you are using the 'Call using computer' or VoIP option to connect to your audio conference: 

• Test your audio after each troubleshooting step below, and proceed to the next step if the echo still occurs.

To correct the problem:

• Try moving your microphone or headset further away 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. Headsets with standard 3.5 mm audio jacks usually work better than USB or wireless headsets.
• In the Webex Meetings client the audio input control has evolved in such a way that the settings are adjusted automatically.