While I'm sure you are aware, MediaSense is EoL: https://www.cisco.com/c/en/us/products/collateral/customer-collaboration/mediasense/eos-eol-notice-c51-738857.html
In terms of number of devices ABLE TO BE RECORDED, its not really a limitation of mediasense. You can either record via BiB in CUCM or via Network Span. Then you have a storage limitation which really isn't quantifiable in terms of devices recorded.
In terms of concurrency; please look at the virtualization chart here: http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-mediasense.html
That number is probably around 20-30 simultaneous calls.
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let me see if I understood there is no limitation by devices, and it may be to have 20 to 30 simultaneous calls is this?
Is there any document that says this?