Hardware echo cancellation without buying a new Sangoma A400?

I’m having some serious echo issues on our PSTN lines that oslec doesn’t seem to adequately solve. Is there any kind of external module that I can run the lines through that will handle the echo in hardware, or is this something that I need to buy a new A400 for? I originally bought one without echo hardware thinking software would handle it fine. That turned out to be a bad idea.

Not as far as I know, but there are some things to check before, like gain adjustment.

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