A system for allowing a telephone subscriber to selectively block incoming calls for selected time periods or during programmed time intervals. A subscriber may pre-program a time interval in minutes, or a time period (start time and end time) for which some or all incoming calls are to be blocked. The...http://www.google.fr/patents/US5467388?utm_source=gb-gplus-shareBrevet US5467388 - Method and apparatus for selectively blocking incoming telephone calls
Method and apparatus for selectively blocking incoming telephone calls
