Miguel_Cruz@ub.cc.umich.edu (08/05/89)
sandy47@ucsco.ucsc.edu wrote in Telecom Digest 9.269: > which gave actual details, including Radio Shack part numbers for building a > "Yellow" box. Basically a resistor to be switched in at time of ring-receipt (About a device used to defraud telephone companies by keeping billing from starting on incoming long-distance calls.) Actually, it was a "black box". The Yellow box is something else (not sure offhand, but I can check).