One solution is to disable the dahdi helper module in FreePBX. Then it won’t overwrite any customizations you need, IMHO oslec is a better echo canceller if you have it installed . As James said, you need to tune your FXO lines with fxotune (and adjust your rx/txgains for milliwatt equality) prior to trying to reduce echo out of any echo canceler.
It’s a digium 4 port card, not sure the exact model, it’s a little older.
If I run fxotune will it save the appropriate settings in the configuration file automatically?
Thanks!