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For the benefit of receiving less robocalls, I support this.

However, what interested me is the ability of the FCC to govern who can interconnect with whom. Could the FCC say that network providers aren't allowed to carry traffic originating from certain IP addresses or hosts? That would certainly have a profound cooling impact on the internet if they could.

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The law that facilitates this action is specific to telephone:

https://www.fcc.gov/TRACEDAct

Since this is the old-school phone system, even though IP is used as a transport, SS7 is the actual protocol being used to interconnect providers. That would be the affected protocol I think.

Not so much anymore. I worked (last day was yesterday) at a company that had services on the call path. The legacy product, supporting CDMA, is on SS7. The newer stuff, supporting LTE, is Internet based (SIP over UDP to us).

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