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I'm one who has used number spoofing for good. I create a system to call patients and remind them of medical appointments many years ago, and we would spoof the Caller ID number so that it showed the call coming from the appointment desk of the relevant Doctor's office, even though all the calls were actually originated from a central location. The company had ownership of all phone numbers we displayed, and it was beneficial to users who could call back and reach an appointment desk with the power to help them.



Yeah, that's one of the issues. There are actually quite a few legit reasons to spoof Caller ID. So "ban spoofing, period" is pretty much a non-starter.


Just do it like SPF does for email; the legitimate owner of a number may delegate its use to anyone they choose.




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