... package loss, transmission speed, MD IDF delay), Voice (VoIP testing supporting SIP).Consequently, it becomes the best choice for ... xDSL, IPTV, VOIP service confirmation testing, maintenance and troubleshooting.2. Key Features ... viewing-Powerful DSL test functions-Makes determining IPTV and VoIP quality fast 3.Main FunctionsDSL TestxDSL testPhysical layer ...