ADVERTISING METHOD EMPLOYING RETURN CALL TONE Russian patent published in 2002 - IPC

FIELD: advertising with use of telephone. SUBSTANCE: according to invention switching system identifies return call tone and if this return call tone is busy tone it is directed to telephone set of sender but if return call tone is call tone signal switching system searches through information on recorded participants stored in data base and checks whether telephone number of sender corresponds to participant recorded in data base. If sender is not identified as recorded participant call tone signal, is directed, as it is, to telephone set of sender. If sender is identified as recorded participant then return call tone with advertisement specified in advance and taken from storage is sent back to telephone set of sender. EFFECT: reduced cast of telephone call, enhanced efficiency of advertising. 4 cl, 8 dwg