[sdramsey00]

Having managed the "global black list" for a major VoIP company (millions of subscribers) I can tell you it does make customers happy. However ... if you implement one you will inadvertently block valid calls. The FCC and big phone companies are correct about that. It's just not possible for someone like AT&T to take the risk.

Real life problems you will see and have to deal with: - blocking of valid calls from legitimate voice broadcasts (i.e. schools / municipalites) - managing trouble tickets from other phone companies opening tickets constantly for "blocking the call" - managing trouble tickets from customers about not getting calls they should have - how to deal with call attempts that do not provide proper signaling information (i.e. "anonymous" as the actual caller ID and not using RPID, PAI, or SS7 appropriately)