title: Best way to implement "user to user" VoIP on iOS
body: <p>I have seen some great libraries to implement VoIP on iOS but they all apply for making calls to actual numbers. All I need is communication between users of my app. Siphon seems like a great option but you have to configure it with a service which allows you to make calls. All I need is communication between my users, maybe there is a better way to do this.</p>
  
  <p>Any advice is appreciated!</p>