Yes, currently the implementation just sends the link. There is also experimental more integrated support for basicWebRTC server in desktop, currently it’s disabled in 1.15 series, but there is a working prototype of accepting the calls from within desktop app. As for truly integrated 1:1 WebRTC calls, it should be technically possible. I did some experiments at ~link2xt/webrtc-clipboard-call - sourcehut git, establishing a WebRTC call requires exchanging only two emails, but you need a separate external TURN server to bypass NATs, which email providers do not provide. Overall, current WebRTC implementation is not yet as good as it can be. The best thing we can do short-term is providing an integrated Docker setup (here is a setup I use for local testing on Raspberry Pi: GitHub - deltachat/docker-mailadm: Local testing environment for Delta Chat based on mailadm (https://github.com/deltachat/mailadm)) for self-hosted small email providers, with a TURN server and basicWebRTC installed and preconfigured for new accounts. NAT bypass is the main problem of decentralized setups and one of the reasons Matrix integrates Jitsi Meet with a whole web server behind it as a widget.