WIFI Calling - Walkie Talkie

WIFI Calling - Walkie Talkie is the best free calling service, WIFI Calling - Walkie Talkie is a Push-to-Talk app which allows you to talk for free over wireless networks (lan).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.How to use :
If you want to send voice message to a single user, press the walkie talkie button and set IP address that you want to talk with.Push to speak button, hold and speak.