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Ah, yes.? We have had the same problem!? I bet every one of those radios is a recent Yaesu model - their UI is really easy to mess this up without knowing it.

What we did was to add a USB sound dongle to one of the Raspberry Pi computers that host our Echolink / AllStar link network interfaces.? The repeater is a Yaesu DR-2X to which we have added a Arcom controller for overall management.? The repeater receive audio is tapped into and passed to the audio dongle through a DC blocking capacitor; Direwolf watches the signal, decoding what it can.? Its output is appended to a log file, which the control operators can read via a remote console over the Internet.? We chose not to broadcast the miscreant's call sign over the air, to be sure we have a human in the loop.

One thing we had to wrestle with was that the Raspberry Pi was crossing the audio streams as soon as Direwolf was started.? Some research suggested it was a known problem with the Pi-4B version that we had, though I still can't fathom how that would occur.? Regardless of the cause, we simply configured Direwolf to not open the transmit side (used "null" as the Tx device instead of letting Direwolf open the dongle for both Rx and Tx), and that fixed it.? Direwolf is started as a "Service" when the Pi is booted.

Hope this helps!

Greg? KO6TH