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Spoofing caller-ID is easy using VOIP (as phone scammers well know), but 911 does not use caller-ID per se. Landlines use ANI/ALI.

This is why swatters often call non-emergency police numbers instead of 911. In this case the swatter called Wichita's City Hall.

Its "easy" because VoIP providers are not held accountable. Force them to "KYC" and it would not be so "easy".