This is a way of communicating on the half-duplex communication line, includes receiving and transmitting devices (walkie-talkie) by the way of pressing the button for switching to the voice mode or transition to the listening mode. It works as a radio speaker; one can talk by pressing the button and can listen to a voice message by releasing the button.
Telefone através de VOIP para todo o mundo a baixo custo. Fale para telemóvel em Portugal por 3,25 cêntimos. Também com soluções e tarifários para empresas