Yamaha PJP-EC200 Setup Procedure page 8

2. Adjust the echo canceller settings.
1) Ask the other end to check that echoes are not generated after he/she talks.
When using a tie-pin microphone or a handheld microphone on your side,
keep the microphone moving in the actual conference room and then ask
the other end to check that echoes are not generated after he/she talks.
2) If echoes are generated, set the DIP switch
in "Setup") and then ask the other end to recheck.
3) If echoes are still generated, turn down the speaker level of your PC or
webconference system or decrease the microphone gain of this unit.
3. Configure the noise reduction settings.
1) To transmit any sounds (voice, environmental sounds, etc.) to the other end,
set "MIC/LINE IN1" or "MIC/LINE IN2" of "Noise Reduction" to "Disable".
2) To receive any sounds (voice, environmental sounds, etc.) from the other
end, set "CONFERENCE IN" of "Noise Reduction" to "Disable".
PJP-EC200 Setup Procedure
(EC TYPE) to "2" (see step 8
8