Jitsi Meet and Matrix are missing system-wide/background push-to-talk (PTT) (to replace Discord).
Tell Jitsi -> github.com/jitsi/jitsi-meet-electron/issues/210
Tell Matrix -> github.com/element-hq/element-web/issues/15284
Tell Element Call -> call.element.io (Settings > Feedback)
Tell SimpleX -> github.com/simplex-chat/simplex-chat/issues/2398
Alternatives?
No, it doesn’t. It has IDs for unique users, but tries to mitigate the risks by keeping a separate set of IDs to use with each contact. (This is like having a separate Matrix/Jabber/Signal/whatever account for each contact.)
Okay, that clarifies what you want, but SimpleX still doesn’t do what @just_another_person said it can’t do. You seem to have misunderstood them.
Also, what’s with the downvotes? Do you expect people to spend their time trying to help you when you respond like that?
No offense, votes help sort comments and we’re moving off topic but your other comment is more useful, thanks again!