https://www.bleepingcomputer.com/news/security/discord-rolls-out-end-to-end-encryption-for-audio-video-calls/

Discord has introduced the DAVE protocol, a custom end-to-end encryption (E2EE) protocol designed to protect audio and video calls on the platform from unauthorized interceptions.

DAVE was created with the help of cybersecurity experts at Trail of Bits, that also audited the E2EE system's code and implementation.