i NEED TO HAVE EXT 8200 PROGRAMMED SO WHEN CALLED IT ROLLS TO 8201 AND 8202...IN HUNTING GROUPS I SEE A HUNT GROUP BUILT 8200 ROLLING TO 8201 AND 8202 ..ALTHOUGH EXT. 8200 HAS NO KEY BUILT FOR 8201 OR 8202...WHEN 8200 IS CALL ED MORE THAN ONCE IT IS A RING NO ANS...WHAT AM I MISSING THANKS .....