How to install client for Voice Call over socket client in android

Hi guys, I am planning to add a direct serverless voice solution to my application, from my thoughts each client needs a server socket (?) And a client socket (?) To establish a connection on demand, the rest should be the same how to write a voice to a file. and instead write to (socket?) on tcp. but since its a rather long shot, I need more help, for example can I send and receive 2 sockets at the same time? or more importantly, does the socket keep reading and updating the output at that time? or is there a better way? any suggestions? Many thanks.