A DEVICE FOR ALLOWING TO MAKE A TOLL-FREE TELEPHONE CALL

摘要

A device for allowing the user to make a toll-free telephone call, comprised of a circuit (8) for checking whether a telephone call has been put through and a predetermined time interval has elapsed since the linkage thereof, as well as for making the talking mode of said call unavailable after said predetermined time interval has been completed; a serial communications circuit (9) which acts as an interface between a user (2 and 6) and the device (1) itself; at least a circuit (10 and 11) for transmitting a pre-recorded publicity message to each of the users (2 and 6) participating in the call; and a central processing circuit (7) for managing all circuits (8, 9, 10, 11) in the device (1).