
This is a scan of an old Wisconsin Bell/Ameritech Official Telephone Directory (OTD). This is the internal phone book used by the phone company for keeping track of all their secret phone numbers. It is highly prized by hackers/phreaks. This version is quite old now, so it should be safe to give out. Most of the phone numbers no longer are in operation or have been changed. It can still be a good reference for studying your telephone company's operations hierarchy.
Scanned were only the cover (shown above), the first few pages of the index, the entire General Services Section, two pages of Emergency Operations section and one page of the Emergency Residence Numbers section. The other 100 pages or so contain an entire list of employee names, numbers and office locations. It also has central office contact numbers and their locations. There is an Organizational List containing contact numbers and locations from everyone from lawyers, accountants to trunk administrators. The Emergency Residence Numbers section contains a list of the personal home phone numbers of the major employees to contact is case of an emergency. The final section is the corporate wide office contact phone numbers.