If one modem doesn't pick up, the call will roll to the next modem. One evening, all the backup lines start ringing at once.
Fish immediately checks for problems with the digital lines.
But they check out fine. So he hooks a regular telephone on one of the lines. The next time it rings, a different little girl apologizes for dialing the wrong number. He finally gets one little girl to tell him whom she's trying to call. If it gets printed, you get a sharp Shark shirt.