title: how to integrate VoIP in android application?
body: <p>I want to make free calling application through net to mobile or land line call using VoIP. I have not much knowledge of VoIP. I get inspiration from using some application like line,Skype,etc. how can I achieve domestic and international call using VoIP in android application. I search lot about but I cannot get direct and easy to understand resource to get this task. so if any one have any idea or resource then most well come to achieve this task of my application.  </p>