Monumental and dramatic combining the influences of Robert Mallet-Stevens, Donald Judd and Le Corbusier the pieces, though spectacular in an Art Brut sort of way, are not exactly whatyou would call warm and cozy.
One of them is the call rejection patent (US 6253075), another is one that details a way to control call status like hold, end or what have you (US 6070068).
If you wanted to do only one task and do it the same way every time, you would do better with a custom chip design -- what the engineers call an application specific integrated circuit.