Once tone dial was introduced, there certainly was never a requirement
> that the tone generator be connected to the wall by a wire all the
> way. The Apple Newton had that capability over ten years ago, and I
> remember reports of other portable devices that could dial that way:
Do I have a vague memory that a very early version of Now Contact -- or some other Mac application? -- could tone dial to a handset through the computer's built-in speaker?