Hi,
Fundamentally, the echo that you heard is the voice reflected back to the OBi 100, which mean that the other party does not cancel out the echo well, and transmit it back to your device.
OBi device has incorporated a fully adaptive echo canceller, and no user configuration is needed.
Since echo is really originated from the other party, if you call a different number, you may have totally different echo experience, is it the case here?
Please contact our support team at
support@obihai.com, we can further clarify this issue, thank you,