A permanent disconnection occurs when a subscriber has permanently relinquished a number, or the provider has permanently reversed its assignment of the number to the subscriber. Upon disconnection, providers must report the telephone number to the RND and then age the telephone number for at least 45 days prior to reassigning the number.
The complete definition of permanent disconnect is:
Occurs when a subscriber permanently has relinquished a number, or the provider permanently has reversed its assignment of the number to the subscriber such that the number has been disassociated with the subscriber for active service in the service provider’s or Toll Free Administrator’s records. Permanently disconnected numbers therefore do not include instances where the phone number is still associated with the subscriber, such as when a subscriber’s phone service has been disconnected temporarily for nonpayment of a bill or when a consumer ports a number to another provider. A ported number remains assigned to and associated with the same consumer even though a different provider serves the consumer after the number is ported. (FCC 18-177, ¶38).