I have usually used a Spirent traffic generator to perform these type of simulations (Its a hardware box & a very expensive box). One software tool i remember is Ostinato which can simulate voice + other traffic patterns as well (installable on windows). Even you can use IP SLA built-in feature set to generate voice traffic. Apart from this, Microsoft have come up with a QoS traffic generator. Below is a link you can go through
One more tool which i would highly recommend would be D-ITG (Distributed Internet Traffic Generator). This tool can simulate voice as well. Link to check would be http://www.grid.unina.it/software/ITG/
I'm not sure of reporting features with any of the above tools, you may need to check. Probably, you can use solarwinds to extract the data using SNMP for reporting
Tools for stats : ntop => a great tool but not enough details for my use.
Tools for traffic : iperf => easy to use
For netflow, as I use cisco 2960, it's not possible, unless if a tool capable of doing the same thing exist.
Do you know some ? lol
(actually I found some tool on the net, fprobe who generate netflow frame and nfdump who collect and analyse the frame. But the results I have are not the results that I expected, if you have some infos on this tool)
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