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I believe the calls still require the server to bootstrap to connection but I could be wrong.

https://jami.net/ decentralized, encrypted, p2p, no phone number required.

I'm not sure why nobody uses it.

Because it's incredibly unstable, and horrible to use? Yes, tried it, even earlier, when it was called GNUsomething.

EDIT Ring. It was called Ring.

Wait, so I can geolocate someone and figure out their ISP by starting a Signal call? Great feature, I love it!

Yes, if they pick up, but you can disable p2p in the settings.

Calls can be relayed through Signal servers:

> Always relay calls:

> Relay all calls through the Signal server to avoid revealing your IP address to your contact. Enabling will reduce call quality.