def play_audio(sound_url = 'http://www.telapi.com/audio.mp3')
      response = Network.post(['Conferences', self.conference_sid, 'Participant', self.call_sid], { :AudioUrl => sound_url })
      Participant.new(response)
    end
def play_audio(sound_url = 'http://www.telapi.com/audio.mp3')
      response = Network.post(['Conferences', self.conference_sid, 'Participant', self.call_sid], { :AudioUrl => sound_url })
      Participant.new(response)
    end
Play pre-recorded sound from a file to conference members, returning a Telapi::Participant object
 See http://www.telapi.com/docs/api/rest/conferences/play-audio/

 Required params:
 +sound_url+:: URL containing an audio file