Hands-free mode for a half-duplex communications system

The half-duplex communication system in such as GPRS system and so on wireless and system is substrate. System comprises two or more terminals (1A, 1B and 1C); one or more terminal capable, wherein exempting hand-free the mode operation. The is in exempts hand-free mode, a system in the control (11A, invention, 15A and 17A) is a terminal (1A) for providing to speak no need to a user to send of the voice request. The sealing to control improving user is connected to participate the communication session via.