I feel your pain. Great comments.

I have contacted the FCC and suggested that caller id information be generated only from the service provider (versus end user equipment as can be done today)with billing information being encoded into each and every call. This would reduce spoofing (since billing information is subject to more scrutiny versus current caller id protocols) and result in the ability to pursue harassment, fraud, and communications act violations.

That is what ANI ( Automatic Number Identification ) is supposed to be for :
https://en.wikipedia.org/wiki/Automatic_number_identification
{ it is not an thorough article }

Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes.

ANI is different, conceptually and technically, than caller ID service. A caller's telephone number and line type are captured by ANI service even if caller ID blocking is activated. The destination telephone company switching office can relay the originating telephone number to ANI delivery services subscribers. Toll-free subscribers and large companies normally have access to ANI, either instantly via installed equipment, or from a monthly billing statement. Residential subscribers can obtain access to ANI information through third party companies that charge for the service.[4]

ANI is generally not transmitted when a call is operator assisted; only the area code of the last switch to route the call is sent.

Why are you blocking a legitimate post?

DNC list is a starting point for scammer call lists. The only effective block is a call blocker which is available from many sources.Get a good one with at least 800 to 1200 items in the block list.

DNC list is a starting point for scammer call lists. The only effective block is a call blocker which is available from many sources.Get a good one with at least 800 to 1200 items in the block list. This call has a Chicago area code. Chicago is a vipers nest of scam operations. Robo scammers could be traced if our politicians would require phone companies to give the actual source on the CID or require NO-MO-ROBO blocker filters on all calls. MY cpr blocker blocks all my identified area codes in the chicago area. One ring and they are gone.