Can we please get some sort of concrete indication whether someone has voice chat enabled? Right now the only way to tell is start talking and hope someone replies. Even better, why not give us an option to only join people with it enabled, much like the language settings (play will all)?
Don't knights have a microphone icon next to them in the top-left listing when they have voice chat enabled?
Or are you talking about people disabling hearing voice chat from other players?