Is it possible to stream audio to a live Twilio phone call?

Is it possible to feed a live twilio phone call with a audio stream from a url? This audio stream should then be played back to the caller. For clarification: I do not want the stream of the call itself (using twiMLs <Stream>), nor do I want to playback a fixed audio file (using twiMLs <Play>), I would rather like to play from a stream to the caller.