| Number Administration Status Transitions | |||
| Transition From | Transition To | Trigger | Controlling System Function |
| Initial Creation | SPARE | An Administrator opens a new Toll-Free NPA-NXX. | Number Administration (NA) |
| SPARE | RESERVED | Successful reservation by Responsible Organization (Resp Org) Entity User or an Administrator. | NA |
| SPARE | UNAVAILABLE | An Administrator action. | NA |
| RESERVED | ASSIGNED | Customer Record (CAD) (also known as a CR) provisioned against the number. | Customer Record Administration (CRA) |
| RESERVED | SPARE | Time since transition from SPARE to RESERVED has reached specified limit (Reserved Duration Limit, currently specified by FCC as 45 days) or User action. | NA |
| RESERVED | UNAVAILABLE | An Administrator action. | NA |
| ASSIGNED | WORKING | CR has been sent to Service Control Points (SCPs) and accepted by at least one. | CRA |
| ASSIGNED | RESERVED | CR provisioned against the number, but deleted by Resp Org Entity User, and Reserved Duration Limit timer has not been reached. | CRA |
| ASSIGNED | SPARE | CR provisioned against the number, but deleted by the Resp Org Entity User, and Reserved Duration Limit timer has expired. Or Assigned Duration Limit, currently specified by the FCC as 6 months, expires. | CRA |
| WORKING | DISCONNECT | CR disconnect has been accepted by all SCPs and intercept routing is being provided. | CRA |
| DISCONNECT | TRANSITIONAL | End Intercept date has been reached and SCPs have deleted CR. | CRA |
| DISCONNECT | SPARE | Time since transition from WORKING has reached specified limit (currently specified by FCC as 120 days) or Resp Org Entity User or an Administrator action. | CRA |
| TRANSITIONAL | SPARE | Time since transition from WORKING has reached specified limit (currently specified by FCC as 120 days) or Resp Org Entity User or an Administrator action. | NA |
| TRANSITIONAL | RESERVED | Resp Org Entity User or Administrator action. | NA |
| TRANSITIONAL | ASSIGNED | CR or Pointer Record (PAD) (also known as a PR) can be created when the Toll-Free Number (TFN) is in a Transitional status. | CRA |
| TRANSITIONAL | UNAVAILABLE | An Administrator action. | NA |
| DISCONNECT | SUSPEND | “New Connect” CR entered while number is in DISCONNECT status. | CRA |
| SUSPEND | WORKING | CR to restore service has been sent to SCPs and accepted by at least one. | CRA |
| SUSPEND | ASSIGNED | Intercept period ends and “New Connect” CR is pending. | CRA |
| UNAVAILABLE | SPARE | An Administrator action. | NA |