Trying Asterisk for the first time.
A simple echo test in extensions.conf works fine, however the outgoing sound quality over the PSTN is extremely poor and completely unacceptable.
I’ve spent days on looking for IRQ issues etc, however I have not found any issues and nothing has changed. I have also disabled the VGA frame buffering and ensured that an X Server is not running.
Previously I tried a TDM410 and had perfect outgoing sound quality and nothing coming in, I suspect the card is faulty.
How hard can this be!?