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Anyone recall the story of data in X25 connection declined message and the invention of the "mini call" as a response?

Or ISA buss triple width 3DES cards with a funky fully potted encased circuit to do SuPeR SeKrEt CrYpTo over the wire

I definitely expected to see X25 mentioned somewhere in the article

Could you elaborate? This sounds interesting.

It's more rumour than proof. But, it's said a bank worked out that an X25 call reject response had enough data space to pass a transaction payload and coded their ATM to use incomplete calls to pass the higher protocol messages. Because X25 was modelling phone networks it only charged for completed connections: it was a free call.

The protocol got a new minimal, mini-call model which didn't expect more than one packet each way to take account of it.

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