Special Codes
Some of the special codes a person could get onto are in the chart below. "NPA" is a U.S. telephone company term for 'area code'.
- NPA+100 – Plant Test – Balance termination
- NPA+101 – Plant Test – Toll Testing Board
- NPA+102 – Plant Test – Milliwatt tone (1004 Hz)
- NPA+103 – Plant Test – Signaling test termination
- NPA+104 – Plant Test – 2-way transmission and noise test
- NPA+105 – Plant Test – Automatic Transmission Measuring System
- NPA+106 – Plant Test – CCSA loop transmission test
- NPA+107 – Plant Test – Par meter generator
- NPA+108 – Plant Test – CCSA loop echo support maintenance
- NPA+109 – Plant Test – Echo canceler test line
- NPA+121 – Inward Operator
- NPA+131 – Operator Directory assistance
- NPA+141 – Rate and Route Information
- 914+151 – Overseas incoming (White Plains, NY)
- 212+151 – Overseas incoming (New York, NY)
- NPA+161 – trouble reporting operator (defunct)
- NPA+181 – Coin Refund Operator
- 914+182 – International Sender (White Plains, NY)
- 212+183 – International Sender (New York, NY)
- 412+184 – International Sender (Pittsburgh, PA)
- 407+185 – International Sender (Orlando, FL)
- 510+186 – International Sender (Oakland, CA)
- 303+187 – International Sender (Denver, CO)
- 212+188 – International Sender (New York, NY)
Not all NPAs had all functions.
Read more about this topic: Blue Box
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