Hi how can i write a voice chat server with

Question

Hi how can i write a voice chat server with

boost asio ?
the server platform is windows
and client is android app
And this chat voice is a part of a game.
I working with unreal engine.
I looking for a way to capture voice and serialize it and send into voice server.
unreal uses c++ language and for building app it use NDK
But I don't have any idea how can I access android api
Can anyone help me ?
How this works ?