Per ATIS-0300119, Thousands-Block (NPA-NXX-X) & Central Office Code (NPA-NXX) Administration Guidelines (TBCOCAG), Section 11.1.5:
When a Thousands-Block Holder is donating/disconnecting a Thousands-Block to the NANPA, the Thousands-Block Holder is required to complete the following fields on the Part 1 in order for the NANPA to update the Contamination information for the Thousands-Block:
- “Block contaminated?” (Yes or No)
- “If contaminated, how many TNs are not available for assignment?” (Enter quantity)
- When the SP enters a quantity greater than 100, the request shall be denied unless the SP notes that it is Exiting the Market in the “Comments” field.
- “Have all IntraSP ports been completed?” (Yes or No)
- When the SP answers “No”, the request shall be denied.
- “Has the Thousands-Block been protected from further assignment?” (Yes or No)
- When the SP answers “No”, the request shall be denied.
A Thousands-Block may only be donated/disconnected if the Thousands-Block does not contain more than 100 Unavailable TNs. This includes the donating/disconnecting Thousands-Block Holder’s Unavailable TNs and all other ported TNs identified in NPAC to other SPs.
SPs shall ensure that all donated/disconnected Thousands-Blocks are within CO Codes that have been flagged as LNP capable in the LERG™ Routing Guide and opened in the NPAC, and that the associated Switching Entity/POI(s) are LNP-capable and ready to process terminating traffic.
SPs shall complete their ISP Ports and protect the Thousands-Block from further TN assignment prior to the submission of the Part 1 to disconnect the Thousands-Block. If ISP Ports in the NPAC are not completed or the Thousands-Block is not protected from further TN assignment, and a donated/disconnected contaminated Thousands-Block is Assigned, there may be service disruptions to customers Assigned Numbers from the Thousands-Block and potentially double assignments for those contaminated TNs. See Section 7.1.16 for resolution of double assignments.
An SP donating/disconnecting a Thousands-Block containing a test line number shall disconnect the test line number prior to submitting the Part 1to disconnect the Thousands-Block. The test line shall be re-Assigned to a number in a Thousands-Block retained by, or Assigned to, the SP.
An SP donating/disconnecting a Thousands-Block that contains an LRN shall migrate any ported numbers or Pooled Thousands-Blocks utilizing the LRN to another LRN within a Thousands-Block being retained by or Assigned to the SP and delete the LRN in the NPAC and the iconectiv® LERG™ Routing Guide.
An SP donating/disconnecting a Thousands-Block(s) which has any special status or treatment, e.g., restricted use, chatline, etc. shall indicate that in the “Comments” field on the Part 1 disconnect.
When the CO Code is already a Pooled CO Code, SPs shall place a ‘D’ on the NXD-A screen in the Business Integrated Routing and Rating Database System (BIRRDS) prior to submitting the Thousands-Block disconnect.
When the CO Code is a Non-pooled CO Code the SP shall build the records for any Thousands-Blocks being retained on the NXD-A screen after the NANPA has approved the disconnect. At the time the NANPA processes the disconnect the NANPA shall update the BCR record in BIRRDS with the Effective Date indicated on the Part 3.