Alexey , new data for you. Please be advised to see below
Latest reports from the field are these test results here:
parameters:
-other caller using macOS catalina laptop and safari
-me call from iPhone using apple safari or firefox
results:
-we can both see eachother fine.
-he cannot hear me, unless I join the room from the actual Jitsi app itself.
-same situation with iPad instead of iPhone. Does not matter the browser.