title: Twllio : Play Sound during call
body: <p>I want play sound during call, so receiver will able to listen that sound.</p>
  
  <p>Suppose, I am in office, And I want play sound of traffic during Twilio Call. Is this possible using Twilio in iOS ?</p>
  
  <p>If I select button to play traffic sound, then only receiver can able to listen the same. If receiver select to play sound of Party, then only caller can listen that sound, not both the parties.</p>
  
  <p>If yes, What are the possible ways to implement the same.</p>