In another approach with the diverter, the phreaker dialed the "automatic number identification," or ANI number, used by phone company technicians, and in this way learned the phone number for the outgoing diverter line. Once the number was known, the phreaker could give out the number as "his" callback. To answer the line, the phreaker just called the business’s main number that diverted the call. But this time, when the diverter picked up the second line to call the answering service, it effectively answered the incoming call.