End-to-End QoS is Necessary but not Sufficient

In this interesting post, Network Instruments' Rick Kingsley says finding VoIP problems requires tracking QoS end-to-end on the LAN and WAN with an analyzer.   Kingsley is dead to rights on needing an end-to-end view and looking for sudden change. To take it the next step requires being able to go back in time and correlate device, QoS and Layer 7 metrics to understand the cause of the problem.  Finally, you'll find it useful to be able to share that view with the NOC in control of the WAN if that's where the problem is, or get granted access to whatever link in the chain has the problem.  Thus those features in Streamline.