Self-hosted echo/sound-test service for Telegram voice & video calls — answers, echoes your audio back, and records it, so you can verify calls work over flaky links, DPI firewalls, or proxies. Built on TDLib + tgcalls.
telegram cpp webrtc dpi self-hosted censorship-circumvention voip video-call voice-call tdlib echo-test tgcalls connectivity-test
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Updated
Jun 23, 2026 - C++