[singpolyma3]

This is already not allowed.

If your carrier accepts a spoofed call they're already violating FCC recommendations.

[kbelder]

Recommendations aren't requirements; you're allowed to violate them.

[singpolyma3]

Of course

[saintfire]

And yet, I incessantly get spoofed numbers calling me from the same "central office code". Also resulting in people with the same code "returning my calls" and then getting angry that I say I didn't call them.

Preventing number spoofing would help significantly with spam calling. At least the ones from local numbers.