A VoIP provider was at the heart of billions of robocalls made over the past five years that broke a slew of US regulations, from enabling telemarketing scams to calling numbers on the National Do Not Call Registry, it is claimed. Los-Angeles-based XCast Labs allowed robocalls from telemarketers to flow through its voice-over-IP network to folks despite multiple warnings over several years that many of the calls ran afoul of the America’s Telemarketing Sales Rule (TSR), the FTC alleged in a 13-page complaint [PDF] filed May 12 in a California federal court.

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