WiFi Walkie Talkie app is a best solution to communicate free on same WIFI network. A free PTT ( Push to talk) application for free communication.

With this application, you can transmit your voice data to all devices which are on the same network or to any device which you know its IP address.

This app is a walkie talkie application that allows any number of users to talk to each other instantly, works with devices connected to the same network segment.