pixel streaming to UE server is one way streaming
video in ue-game server (stream data) → turn server → many client pc
client pc control (very small data )-> signalling server → ue-game server
it does not have way to send streaming data from client to ue-game server so if you need integrating the voice chat pixel streaming to UE server you must implement many problem
simplest is using 3rd party streamming or create a server for voice chat (modify signalling server cirrus.js)
“GitHub - amirsanni/Video-Call-App-NodeJS: A conference call implementation using WebRTC, Socket.io and Node.js”
client pc voice chat ↔ webrtc voice chat server
and it does not need voice data pass ue-game server