Per ATIS-0300119, Thousands-Block (NPA-NXX-X) & Central Office Code (NPA-NXX) Administration Guidelines (TBCOCAG), Section 11.3.12, the following steps should be taken based on the scenario:

1. Scenario 1: The Part 3 has been issued and the Non-pooled CO Code disconnected was approved and the Effective Date has not yet been reached.
   1. The SP shall to cancel the disconnect in NAS in order to cancel the disconnect view on the ACD in BIRRDS. 
   2. The SP shall take the appropriate steps to cancel the disconnect view on the NXD in BIRRDS.
   3. It is recommended that the SP contact the TRA to negotiate the issuance of an Emergency Notification.  
       
2. Scenario 2: The Part 3 has been issued and the Non-pooled CO Code disconnect was Approved and the Effective Date of the disconnect has passed.
   1. The SP shall re-request the CO Code through NAS by submitting a Part 1.
   2. The SP shall initiate contact with NANPA and the appropriate regulatory authority to get the disconnected CO Code re-Assigned.
   3. The SP shall take the appropriate steps to reestablish the Non-pooled CO Code in BIRRDS.
   4. The TRA shall issue an Emergency Notification if the Effective Date is fewer than 45 calendar days from when the CO Code is reestablished in BIRRDS.
       
3. Scenario 3: A Part 3 suspension has been issued and the Non-pooled CO Code disconnect was suspended to check for or due to ported TNs.
   1. The SP shall notify NANPA via email to cancel the disconnect in NAS.<
       
4. Scenario 4: The Part 3 Non-pooled CO Code disconnect denial has been issued to the disconnecting SP because a Part 3 transfer Approval has been issued to a new CO Code Holder.
   1. The disconnecting SP shall contact NANPA and the new CO Code Holder to obtain their approvals to cancel both the disconnect and the new assignment in NAS. NANPA shall cancel the scheduled transfer on the ACD in BIRRDS if the Effective Date has not passed or modify the ACD in BIRRDS assigning the Non-pooled CO Code back to the disconnecting SP if the Effective Date for the transfer has passed.
   2. The disconnecting SP shall contact TRA to change the AOCN on the CO Code record in BIRRDS and ensure that the Non-pooled CO Code is provisioned in BIRRDS with the appropriate information.
   3. The disconnecting SP and the new CO Code Holder shall ensure the transfer has been reversed with regard to NPAC changes.