Abstract: A communication system which includes a plurality of communication units that are coupled together by a physical conductor. Each unit is provided with a loudspeaker for receiving auditive information and/or a microphone for transmitting auditive information. Certain of the units are allotted a group assignment and are arranged to establish a conference call facility, whereby an analog signal derived from transmitted auditive information is subjected to a sampling process. For the purpose of transmitting auditive information and/or for receiving auditive information, all of the units associated with the group are arranged to utilized one and the same time slot in a time frame used for the sampling process, such that when information is transmitted simultaneously from two or more units, the sampling contributions are summed within time slots via the physical conductor.