SPF / DKIM for phone calls? That would be great, but what about calls that are forwarded by systems that originate from a third party, you want to maintain the original CLID during forwarding so you overstamp it to the outbound call as it's forwarded. With email forwarding addresses, this sometimes leads to SPF issues unless the smtp.mailfrom is set to something other than the original sender's address. Not sure if the same could be implemented for voice comms.
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