Echo will only happen when you go from digital to analog.

Here is more info on this :
http://www.voip-info.org/wiki-Asterisk+echo+cancellation
http://www.voip-info.org/wiki-Asterisk+echo+analog+lines
http://www.voip-info.org/wiki-Asterisk+Echo+Avoidance

And remember : Google is your friend
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