Debug doesn't help much. If anything, it seems to imply that they're sending an 'A' digit when they disconnect.
This is very simple. Call an IP phone through the FXO. Hang up on FXO, not on IP phone. Listen to the stream after the PSTN user has hung up. If the provider plays funky tones, you'll need to disconnect on these tones.
I would start by making sure you've got the correct CPtone configured under the voice port, along with 'supervisory disconnect dual-tone midcall any' and 'supervisory disconnect'.
If there are no sounds, they're sending it via voltage, or none at all.
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