This is a co-invention with my son, Woden.
Why waste all that carrier capacity on the phonelines with a simple 440Hz toon that only the violists can appreciate (for tooning up before a concert ;)? Instead, why not broadcast important public service announcements (NPR? Pacifica radio?) or lots of lousy advertising (?!) or perhaps whatever a subscriber wants to hear when she picks up the telephone at home or office? The Dialtoon replaces the 440Hz monotone on your phone with whatever toon you like!