Well that will surely stop the scammers that use hacked VoIP systems

yeah, just because there is a potential loophole we should make absolutely no effort to solve the problem.

Reminded me of: https://iea.org.uk/wp-content/uploads/2021/12/mister-gotcha-...

In this case it is addressing a large chunk of the problems. Once that is done we can always revisit other ways folks are spamming the system.