I am not aware of such reporting capability out of the box. You can do snapshots on registered/non resgitered phones, using the RTMT plugin, if that is what you are looking for. you can filter based on extension (range), ip address and phone type (among other things). It is pretty basic and if you are looking for more advanced monitoring and reporting, you will probably be looking at 3rd party software like Clarus. (www.clarussystems.com)
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