[makeitdouble]

The CFO already separately sent him a message before the call, and I wonder if they'd get access to the CFO's number in a central directory (leaving aside the fact that you're asking to message them while they're live "in front" of you).

I fthe CFO gave a number on the call, it wouldn't also be much of a check.

I think the real improvement would be to have the CFO file a ticket, but obviously that company was used to play it loose and fast.

[pavel_lishin]

With $25 million on the line, I'd argue that the company could afford an airline ticket to fly to the UK and back to verify in person.

[Detrytus]

They might be able to afford ticket price, but not the time it takes to fly to the UK. Some things are time-sensitive.

[rijx]

It would detect number spoofing. Spoofing is easy, hacking phones is hard(er).