[1]:

  gst-launch-1.0 playbin3 uri="gstwebrtc://localhost:8443?peer-id=<webrtcsink-peer-id>"

WebRTC is normally used in bidirectional use cases like video chat with text options, so I don't think it so odd that VLC doesn't outright support it. VLC does not support dialing into an Asterisk server, either.

[1] https://gstreamer.freedesktop.org/documentation/rswebrtc/web...