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Echo is caused by impedance mismatch, exacerbated by network latency and the use of cheap phones. [NOTE: The DVG-1120M tech specs (no longer on DLINK website) stated that echo cancellation was built into the device.]
You can expect echo on some VoIP calls (more prevalent when long distance/overseas). This can be due to some portion of the network reflecting the signal, or due to other issues - bad echo canceler in the PSTN network, etc. You can always hang up and dial again.
However, if echo is there often, then you may want to consider the following:
•You should also ensure that your telephone cables and plugs are secure. A loose connection can cause some echo.
•Calls to cell phones (cell networks) seem to have a longer latency (time delay), thus more echo, than calls to a wireline PSTN number. In addition, some cell phone speaker phones will also create echo; so ask your caller to not use the speakerphone if possible.
•You can occasionally hear two conversations if you are talking to someone who has two active phone lines on a conventional "twisted pair" analog phone system. For example, if you are talking to someone on one phone line and the second phone line is also in use, you will hear faint snippets of the second conversation. Basically, TBB faithfully reproduces all signals on the line - so if there is a slight secondary signal due to electrical induction (or poor insulators) you will hear the secondary conversation.
To help in isolating the problem, try using a different corded phone plugged directly into the DVG ATA (with no other phones).
In any case, if you hear echo very often, suggest you call TBB Tech Support, as I believe they can do a tweak to your settings somewhere to perhaps correct echo - it varies for each user depending on their network latency.