title: iOS voip app sleeps & Reachability has changed, can I get notification?
body: <p>I'm building a voip app for iOS and I'm handling working at background.</p>
  
  <p>So far, i have iOS listening to the voip socket while app sleeps and wake it uppon incoming data.</p>
  
  <p>My question is:<br>
  When the reachability has changed (Wifi -> 3G, Wifi -> Other Wifi, etc) <br>
  and the app is suspended, can I get some notification in order to reconnect my voip socket?</p>
  
  <p>Thanks.</p>