How to make sound go through loud speaker in AudioContext?

Question

JavaScript

function playSound(buffer, playTime) {
      var source = audioContext.createBufferSource();
      source.buffer = buffer; 
      source.start(playTime);
      source.connect(audioContext.destination); 
    }

navigator.mediaDevices.enumerateDevices() shows the only audiooutput on the phone, the
sound comes from the earpiece