title: Custom sound for remote notification
body: <p>I have to set custom sound when I receive APN in my iOS app.<br>
  For custom sound I mean a sound that every user can change within his app and not different from the default sound.<br>
  I already know that I can set the attribute "sound" on the payload of my notifications, but what I would like to understand if there is a way to play a different sound based on the user's settings (user A can set sound1.aiff, user B can set sound2.aiff).</p>
  
  <p>The only way that I can see is that the notification is already sent with the name of the file to play that the user has set on preferences: this means that I have to store settings on server-side. Now I do not this.<br>
  Do you confirm me that's the only way?</p>