13 hours ago
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?
12 hours ago
Ngl same question for United Arab Emirates
11 hours ago
Its DPI mostly from this company: https://theins.ru/en/politics/265749
10 hours ago
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.
10 hours ago
Time to learn more on DPI, thanks.
10 hours ago
If you want to explore and make some tests of your own, nDPI is the most popular open-source DPI engine.