Correct, MF tones were used on inter office trunk circuits. These were the
tones that people used to simulate to dial free toll phone calls. Each
digit was made up of two tones, but not similar to the Touch Tone
frequencies. Your taking me back to my old phone company Toll Office days
and the 17B board.
73, Joe, k1ike
At 02:13 PM 4/24/2006 -0700, you wrote:
>Hi, I believe the term Multi-Frequency was used to describe the
> early AT&T inter office toll dialing scheme.
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