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harold, 你是否调整了line port gain?那些参数你修改了？你一直有听到回音吗？

leftright

Daibaan, you might have a different issue from Harold's. The echo from your unit is on PHONE port, while Harold has the echo on his LINE port.

May I ask what kind of phone you are using? a US phone or from other countries?

Echo is mainly due to impedance mismatch ... the first thing I would try is to adjust PHONE port impedance and see if echo can be eliminated... You can try a different impedance setting from :

Physical Interface -> PHONE port -> Port Setting -> Impedance. (default 600 is for US phones).

Also, try different phones without changing the setting ... see whether you can find a phone that gives you lower (or no) echo ...

Lower ChannelTxGain is surely a way to suppress echo, however, you will hear lower volume on the phone side, but you may as well adjust your analog phone volume accordingly ...

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I have been using quite a few corded/cordless US phones, and seems OK with OBi110. I would guess the problem might be related to some particular phones, but not in general. Though Obihai does suggest using a cordless phone ...