Appendix C: Procedures for Code Holder Exit

Appendix C: Procedures for Code Holder Exit describes the responsibilities of the NANPA,
the PA and service providers in situations where a service provider (SP) is returning or
abandoning NXX codes that contain ported telephone numbers and assigned thousands-blocks
and a new code holder/LERG assignee must be selected with minimal impact on ported customers.

As a reminder, once a new LERG assignee has been established as a result of a pooled NXX return, the PA and the new LERG assignee will follow the steps outlined in section 4.1 and section 4.1.1 of the Central Office Code (NXX) Assignment Guidelines (COCAG), Appendix C: Procedures for Code Holder Exit:

The PA will modify the existing BCR/BCD record(s) of the original LERG assignee in BIRRDS with the new LERG assignee’s information upon receipt of the Part 3 from NANPA.

The PA will modify all of the available blocks within the transferring pooled NXX to be effective 1 calendar day after the Part 3 effective date of the transfer. This step will ensure that the new LERG assignee has sufficient time to make the necessary NPAC updates. If the new LERG assignee determines that the necessary NPAC updates cannot be made in conjunction with the Part 3 effective date of the transfer, then the new LERG assignee shall notify the PA of the revised date for when the available blocks will be viable for assignment.

The new LERG assignee shall:

notify the PA via email which blocks assigned to the original LERG assignee are to be reallocated to the new LERG assignee because the contamination level is over 10%. This notification will take place within 90 calendar days of receiving the Part 3 confirmation from NANPA.   notify the PA via Appendix 2 which blocks assigned to the original LERG assignee are to be donated by the new LERG assignee because the contamination level is 10% or less. This notification will take place within 90 calendar days of receiving the Part 3 confirmation from NANPA.

Blocks that were previously donated or returned by the original LERG assignee will remain in the pool.

It is recommended that the new LERG assignee retain at least one block to ensure that responsibilities in Section 4.2.1 of the Thousands-Block Number (NXX-X) Pooling Administration Guidelines (TBPAG) are maintained. If the SP determines that the block is not needed and the SP is able to fulfill the responsibilities found in the TBPAG Section 4.2.1, then the SP does have the option of returning the block to the PA.

To access the current COCAG Appendix C located on the ATIS website, click here (link removed).