Walkie Talkie on Wifi

Hi guys,

I have this thought in my mind dont know if it will actually work out. There is a app I use regularly to play around with kid called virtual walkie talkie. Its got functions like act as a server and connect other phones as clients to it and create a private room also can connect to a server in the same network.

I would like to use it at shopping mall with family members. I am thinking of getting a portable wifi router which would assign ip to all the phones and once they are in the network we can connect and use it identify location. I am located in gulf country and most of the popular walkie talkie apps like zello are blocked.

Can this really work out ?

Please let me know.

Thanks