Disclosed is a base station transmission apparatus in a mobile communication system using transmit antenna diversity between a base station with a plurality of antennas and a mobile station. By forming the bulletin board so as to comprise the plurality of adhesive-coated sheets, an exposed adhesive-coated sheet, whose tack level has degraded with time, may simply be removed from the tablet or stacked array of adhesive-coated sheets so as to expose a new or fresh adhesive-coated sheet which can now be used to again securely adhere objects upon the bulletin board. However, rather than dropping all further involvement with the call, the preferred embodiment of the present invention continually monitors the connection thereby established for a predetermined DTMF signal issued by the customer, such as that obtained by pressing the * button.