> How does it work, technically? Now it was decades ago I worked in cold calling telemarketing, but back then, the company basically purchased/subscribed to va

> How does it work, technically? Now it was decades ago I worked in cold calling telemarketing, but back then, the company basically purchased/subscribed to various lists of numbers they get from other companies, and also had lists of numbers to not call, either obtained from the do-not-call registries, or their own lists of "unsellable" customers, bad numbers and so on, simply crossed-references the ones that they for legal (or otherwise) shouldn't call, then the telemarketers who all sit in basically automated stations, end up just calling the "good" numbers. Different teams get different chunks of the numbers, but all the calls they're supposed to be doing, are supposed to not be on any of the do-not-call lists already. The telemarketers themselves are told to basically hang up and mark the number as "do not call" if anyone picks up and says/mentions the name of lists. Most companies I knew from then took the lists seriously since their mechanism is based on actual laws in the countries, and evidently since I nor the people I enrolled in these lists receive marketing calls, the companies today takes them equally seriously.