Telephone provides call restriction capablilities to include call blocking, example: block 1+ calling, can be programmed to dial an access code, allow or block incoming calls, provide separate conversation timers or no timed call for both autodial and keypad from 1-9 minutes, and ajustable wink detect length if necessary. Telephone can not be left off-hook as it detects when called party hangs up and resets itself. Requires 301-064 tool - sold seperately.