3.5 Single Toll-free Statewide Telephone Number with Nationwide Access
All one call centers have a single toll free statewide telephone number with nationwide access.
There is only one statewide toll-free telephone number for one call centers to receive locate requests. This number has nationwide access, meaning that a caller can reach the center from anywhere in the country.
- One Call Systems International Voluntary Recognition Program
- Existing operating practices from various states’ one call centers
- 49 CFR Part 198
- NTSB Safety Study (NTSB/SS-97/01; PB97-917003)