For those of you recommending matrix, have you tried in earnest to use it? I couldn't get reliable video and call to work, even with stun/turn servers properly configured (chrome doesn't trust let's encrypt for ICE certs, that was a fun one to debug, had to go with zerossl).
Sometimes the phone wouldn't ring, rarely did video work.
The element app for android doesn't notify correctly unless the app is open.
For day to day desktop chat it's great, but it falls apart on videoconferencing and mobile
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