A method, an apparatus and a system for processing a voice call. The server includes an insulated server body for reducing heat transfer of heat from the liquid beverage retained therein. The obtained data packet is set as an access unit and is transmitted from a transmission apparatus to a transmission path. The drive system may be coupled between the impeller and the debridement head and be configured to impart movement from the impeller to the debridement head. The shift control elements, which are engaged during an up-shift, are formed as frictional shift control elements, and the shift control elements, which during up-shifts respectively only constitute a shift control element to be disengaged, are made as positive-locking gear elements.