title: Limits on iPhone push notification sounds?
body: <p>Does anybody know of any limitations on the sounds that can be played when an iPhone app receives a push notification?  Specifically, is there a maximum sound length?</p>
  
  <p>Also, I am assuming that the volume of the sound will match whatever the user has set their ringer volume to, and if set to vibrate mode, the phone will vibrate instead of playing a sound.  Is this correct?</p>