Dear,

I have been going through the below link and It would be helpful if you could let me know the below two points.

https://freeswitch.org/confluence/display/FREESWITCH/Specifications

1. like to know more about the maximum concurrent call the free switch can support with the recommended system requirement.
2. Does it need any upgrade in the system hardware requirements/additional packages if one tries to bring SBC before the Freeswitch in case of external SIP trunk configuration.  

Thanks & Regards

Praveen