Push To Talk Over Cellular (POC) is the communication method similar to walkie-talkie style of communication using cellular networks and mobile phones instead of stand alone hardware. In normal Push To Talk (PTT) communication there were limitation like the range and stand alone device for communication and huge technological gap when compared to commercial tele communication devices.
PTT communication is half duplex communication. where only one way traffic is allowed at the same time. POC works based on Voice Over IP (VoIP) technology.In PTT user presses a button and start communication immediately to a specific contact or predefined group. No call set up delay as in case of normal voice call.