National Pooling Administration
Tools - Archives, Tip of the Month - 2006, April
Appendix C: Procedures for Code Holder
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
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).