Based on their tech docs[1], it seems pretty good. 1: https://core.telegram.org/api/end-to-end/voice-calls#key-verification https://core.telegram.org/api/end-t

Based on their tech docs[1], it seems pretty good. 1: https://core.telegram.org/api/end-to-end/voice-calls#key-verification https://core.telegram.org/api/end-to-end/voice-calls#key-ver...