In article , Ron C
wrote:

They don't *just* spoof your local area .. I once got a
spam call that was spoofed as my own phone number.

that's the easiest of all to block with no risk whatsoever. add your
own phone number to the block list. done. also add invalid nanp
numbers, such as all 0s, all 1s, etc.

the problem is blocking neighbor spam, because it could be someone who
might call you one day.