August 1998 HANDELSBLATT (1998c), Internet-Telefonie ab Herbst, OECD, Gateways to the Global Market, Consumers and Electronic Commerce, S. 27 - 64 Harald (1997), Multimedia Call Center, in: TeleTalk, Nr. 08/97, August 1997, S. 27 Auflage, 1992, Orlando (Florida): The Dreyen Press 1992 HOFFMANN, Ute .