> Mmmm having been in the telephone industry for 25 years, I think that's > "Blue Box" used to make illegal telephone calls on circuits that used > SF (single frequency) as the idle circuit signal. When the SF tone was > sent on the circuit the connection would collapse and a new receiver > would be applied in preparation for the next call. It could then > produce "KP" and "ST," "STP" along with other multi-freq tones, and the > good ones would also do "dtmf (dual-tone)" which was needed to > originate the call to an 800 number. > > The telephone lineman's test set is know as a "Butt-set" or > "Butt-in-ski" as it is used to butt into a analog line. > > > > Best Regards, /\*_*/\
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