a paging system , which consists of a number of central stations , each of which contains a number of pager apparatus associated with it . each pager apparatus responds to one or more identifying numbers so that a caller may send a paging message to one or a number of pager apparatus , all of which respond to the same identifying number . the central station includes a profile of information for each pager apparatus associated with it . paging information is comprised of various identification numbers to which the pager apparatus responds , as well as selected type of services . pagers can additionally restrict receiving pages from unwelcome callers , prioritize messages , limit the number of received calls , and arrange for a transfer of their calls from one central station to another central station . the central station can also store voice message providing an indication to the selected pager to call the central station to retrieve voice message . the central station utilizes a protocol which synchronizes the data and the time for each pager apparatus . it can then address messages to one or a plurality of pagers simultaneously , send messages to the pagers or send control signals which can override local controls and enable or disable the local pager operation . the pager can initiate reception outside of the assigned time slot . emergency calls are handled to override any ongoing transmission . auditorium cutoff can arrange to disable the audio response of pagers within the locale . authorization can be required for a transaction . means exist for billing for the processing and transmission of paging data on a per call basis . verification of transmission or a transaction for billing purposes can be via a page or over the telephone network to the caller or to a third party .