1. VoIP Test Tools Make the Grade. Author Chee, Brian and Rist, Oliver Subjects *INTERNET telephony, *TELEPHONE systems, *TELECOMMUNICATION systems, *OFFICE equipment & supplies Abstract Evaluates four Internet telephony testing products. Acterna DA-3400 Data Network Analyzer; Brix System; Fluke Networks OptiView Protocol Expert Plus; Spirent Abacus 5000. Published 2004