1) As per the engmanG2.pdf, J53 should shunt across 2 & 3.
and this should be factory setting, however if circle mark is on pin 1, then it was wrongly shunted and i shunted it to away from circle mark ( to 2 & 3 )
2) I have latest firmware, also followed your posting to update tuning parameters by selective write from default template and then read back to my cclx file . However , i still have the echo problem on DS02 and also on KP06 and KP04 when a remote phone is involved.
1) when somebody presses the door bell while in AWAY mode , the system calls my mobile and i can hear clearly on my mobile the visitors voice , however the visitor at door station hear too much echo .
2) if somebody calls and comfort answers the call , the voice of caller is on Keypads and it echoes a lot .
The other communications like KP04 with KP06 , HOME PHONE with DS02, KEYPADS with DS02, these are working ok .