title: How to implement voice over ip in iOS?
body: <p>I want to make voice/video calls between iPhones App using WiFi/Internet. How should I do that? I don't want to make calls on service provider number. It will make calls between apps on different iPhones like skype.</p>
  
  <p>I didn't fount any way to search. I am getting confuse how to start working on it.</p>