title: Push to talk based on Ip address apps android
body: <p>I want to develop an android app which uses push to talk or Voip to communicate between 2 mobile devices using a Wi-Fi connection without using a data or the internet. </p>
  
  <p>Is it possible to develop this?</p>
  
  <p>I am looking for a 'free' Wi-Fi Walkie Talkie but I don't know how to start doing it?</p>