[Staino94] P. Staino, The 100% Sure Way to Get Fired - Don't Protect Yourself from Toll Fraud, Teleconnect, Jan, 1994 pp57-67 including advertising. [This article describes many of the commercial products designed to detect toll fraud in systems ranging from major switching centers to small PBXs. It includes product listings and advertisements from several companies describing the key features - predominantly out of pattern usage detection and response.]