%im2d The other party complains not hearing your sound in a jitsi meeting? Try echo tests: Janus WebRTC Server: Echo Test or Twilio Network Test . Linux users may also have to look at pavucontrol and make sure the settings are sane. More info below.

Very nice intro articles: How Linux Audio Works vs. Windows Audio in 2017 and Linux Sound Architecture .

You may also want to see the google translated version of my zh_TW article:

Linux 錄音測試/麥克風除錯之作業系統篇： pavucontrol

Especially the list of things to check at the end. Note: "wheat" should actually be "Mic".