Businesses have benefited greatly from adopting Voice over Internet Protocol (VoIP). The technology has provided them with greater call quality, flexibility, and mobility, while costing considerably lower than traditional phone lines. Unfortunately, VoIP also makes businesses vulnerable to telephone denial-of-service attacks (TDoS). But what are TDoS attacks and how do they threaten your VoIP system? How do you protect your VoIP system from them? Read on to get the answers to these questions and more.