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Prevent OTT traffic like kakaotalk, wechat

Hi community,

Can you share your idea can we prevent VOIP traffic like skype, kakaotalk, wechat, line...? If we can, how to do it, in general?. Because as far as I know these applications are peer-2-peer and use dynamic ports and update version very quickly.

The version I concern is

Used version of Line: 3.9.3

Used version of Kakaotalk: 4.0.3

Used version of Wechat: 5.0.1

Thanks and regards,

HIeu

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