Single Port Mode (UDP mux) - pion/webrtc GitHub Wiki

Single port mode allows multiple PeerConnections to listen on a single UDP port. This is needed by users who are in a constrained environment and can only open up a single UDP port.

https://github.com/pion/webrtc/commit/d0a52518b0c1b43ad74efbac4a775185cf3cce8f