your signalling service should be reachable via DNS with a FQDN and a valid certificate!
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WebRTC Signalling service like “Janus WebRTC server” or “Spreed WebRTC server” is required for calls and conversations with multiple participants. The signaling server is used to establish a WebSocket connection between the participants in the call. Without it, all participants would have to upload their own audio/video individually for each other participant causing connectivity issues.
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Examples:
https://signal.yourdomain.tld,wss://signal.yourdomain.tld