the last four digits of the telephone number of the other call 5 if all verification checks are positive the verification unit 9 transmits the data to the transaction unit 10 connected to it and the data sets are removed from the transaction pool memory 19 if no other data capable of being correlated with an incoming data set are found in the transaction pool memory 19 then all data sets that have been contained in the transaction pool memory 19 for longer than the stipulated interval are deleted from the transaction pool memory 19 the transaction pool memory 19 thus comprises a database in which contemporaneously incoming calls are stored and with which incoming data sets can be examined so as to ascertain whether or not data sets can be correlated to one another the transaction unit 10 can convert these data into payment order data 21 these are for example instructions relating to the debiting of an account of the payer as well as in parallel to the transfer of a certain amount to an account of the payee the transaction unit 10 transmits the payment order data 21 in this case for example via an internet connection to the bank of the processing unit and or the banks of the payer and the payee for this purpose an output 20 is provided moreover a signal unit 11 can be connected.