The LEC can block some calls. If you have LOOP START Lines, there's a Device I use on my system called the CPR-Call Blocker. But, it costs a few bucks, and you need one for each line. It does what it's supposed to do, it comes with a good many of the Bad Guys already blocked, but from time to time I still have to program one that slips through. If you have several lines, it could become costly to implement.
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