title: Getting started with a VOIP app for iOS or Android?
body: <p>I'd like to create an app for iOS that does VOIP, presumably by interacting with a website. I can start with Android too.</p>
  
  <p>Does anyone know of any tutorials, suggestions or libraries that would be of any use. </p>
  
  <p>(The app would need to be rewritten for BB and android eventually, too.)</p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>Bonus: What is SIP?</p>