Echo when using analogue line

When using a dahdi analogue line we are getting a one sided echo (our end not the other person). Is there any default settings I should be looking at for echo cancellation? Its a Sangoma A200 card.

We are using a pre built FreePBXAppliance unit
Current PBX Version:
15.0.17.9
Current System Version:
12.7.8-2012-1.sng7

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