It presumably prevents it by forcing them to use a single verified number per corporate entity — this once I blacklist that entity, I can be done with them. The

It presumably prevents it by forcing them to use a single verified number per corporate entity — this once I blacklist that entity, I can be done with them. The real problem these days, IMHO, is not repeated calls but spoofed calls where the source number changes every day, and thus cannot be blocked. This would solve that.