i hear ya and understand.
i retired as a 9-1-1 call center administrator back in '05. in the years before i retired we...the 9-1-1 "community"...and AT&T were in discussions on how number portability would affect 9-1-1's selective routing. the the thought was that Joe and Mary from Albuquerque would be able to keep that number, area code and all, when they moved to Chicago. but how could a 9-1-1 call orignating in say the 312 area code but with a different area code attached to that number could be routed to the correct call center.
when VOIP lines (Voice Over Internet Protocol) became a reality the problem of routing increased. VOIP services were vastly less expensive than tradtional copper lines. my first recollction with VOIPs was a gentleman on vacation in San Fran got ill in a hotel. rather than use his room phone he called 9-1-1 on his VOIP phone and unstead of getting the SF call center he was routed to the 9-1-1 call center in his hometown hundreds of miles away.
spoofing numbers...what i think you're really talking about is nothingbmore than a hack. on our Xfinity "landline" (VOIP) we've been getting daily calls labeled as coming from Greenpeace but each call seems to have a different number attached to it. our NoMoRoBo has intercepted all of them.
back in the day i recall a proposition floated by "someone" that a PIN would be assigned to everyone at birth and that would serve multiple uses including that person's "phone number". glad that didn't go anywhere...yet