The present invention discloses a method and a system for using presence proxies to group presence notifications. In some embodiments, a communications device implements a service policy for assisting billing for the communications device use of a service on a network; and monitors use of the service based on the service policy, in which a local service usage is synchronized with a network based service usage. In the case where the difference is not more than the predetermined pressure P, after the air conditioning mode is started, the waste heat recovering operation mode is started again. Moreover, a highly uniform gluing pattern of the wave peaks of the corrugated sheet is maintained by providing means for adjusting and controlling the compressive force between the gluing roller and the fluted roller.