The problem was from Telecom PSTN. 2Talk confirmed there was an issue this morning, but it was resolved pretty quickly after I posted this thread.
Here's their reply:
Hi Will,
It appears our upstream carrier may have had some intermittent issues earlier today. We also experienced some problems with our SQL cluster which should now be resolved. Can you confirm calls are now coming through okay and advise if not with some example calling parties and times of call failures?
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