Ive actually made a Discord Plugin for UE4 4.15 working on updating some things, im using it on my personal project. I may put it up like I did my Twitch Plugin soon. I`ll let you know <3
**PS I have a WebSocket Working for the Voice, but I havent finished the Actual Audio Portion yet, working on that for my Gameshow.
The current implementation of unreal engine’s voip is tied to online subsystems, but that doesn’t mean it would not work without that. The problem with using external solutions is that security will become an issue. If you focus your interest in game solutions, you are better of with pure voice capture/encode implementations where the audio is available internally for use it with the engine’s audio system.