Communication system, communication terminal, conference expensive unit, a method for controlling a communication system, a method for controlling a communication terminal and method for controlling a conference expensive unit

摘要

A communication system comprising a conference server, a of the conference server managed conference expensive unit and at least one communication terminal,– the conference server is arranged at least a conference to provide for a plurality of communication terminals;– the at least one communication terminal a message generator, which is set up a call - control - protocol - message according to the sip - protocol, which call - control - protocol - message containing control information specifies whether– the at least one communication terminal of a conference is to be added and / or– a conference is to be produced and / or– a conference is to be ended and / or– Information about at least one of the of the conference server conference provided on the at least one communication terminal are to be transmitted;– the conference expensive unit has a detecting device which is set up, from the call - control - protocol - message to determine the control information;– the conference expensive unit has a control device which is arranged, in accordance with the determined control information– the at least one communication terminal and / or to add a conference– a conference..