Well Heather certainly loves to call me and its a combination of either using my area code and prefix or other companies randomly choosing long distance numbers

Well Heather certainly loves to call me and its a combination of either using my area code and prefix or other companies randomly choosing long distance numbers. I have noticed spoofing of 8 numbers as well. how do these get through the phone system, can't they detect ANI being bad at the source? I used to work for a company where we logged our workers on and off shift; rent a cop; based on the ANI data from the phone call. So I am really curious how this isn't blocked by entry into the system.