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How Is Russia Blocking Calls on WhatsApp/Telegram/Face Time/Snapchat/?
6 points by urcite_ty_kokos
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6 comments
urcite_ty_kokos
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Hi, I was wondering how is it technically possible for Russia firewalls to block calls over these platforms, while keeping chat messages working? Thanks
My guess is that it is because of a different layer 7 protocol than HTTP is used for calls, and the code of the protocol leaks in the TLS/SSL header. Is this guess correct?
belter
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Its DPI mostly from this company: https://theins.ru/en/politics/265749
wkat4242
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It won't be the only solution that can do this by the way. Many airplane WiFi services block WhatsApp and telegram calls.
I think they just look at the traffic shape. Real-time traffic requires a lot of constant similar sized traffic per second, rather than texting or images which is much more bursty.