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Block Skype File Transfer outside the network

Hello !!

 I want to monitor/block file transfer via skype for business  (desktop client) and skype (desktop client),whereas chat should be allowed.

Currently I'm using Application File Access Protection rule, which is helpful to some extent.. But it can not block file transfer outside domain.

While searching for the solution came across Network Communication Protection Rule (NCPR).

Classification : 
End-User : 
Network direction:
Network addresses:
Network ports :
Application creating the connection:

HELP !! regarding Network Addresses: what should be the address

and for skype and skype for business if we port use 80/443 then it might block network traffic.. because other traffic might be dependent on 80/443.

Confused !! Can someone help with configurations ???

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