e-Lerts
NANPA Shortens 10-Digit Dialing NPA List, Identifies Carrier Milestones
January 15, 2021
NANPA Shortens 10-Digit Dialing NPA List, Identifies Carrier Milestones
The FCC’s 988 Order requires all telecommunications carriers, interconnected Voice over Internet Protocol (VoIP) providers, and one-way VoIP providers to make changes to their networks to implement 988 by July 16, 2022. To accomplish the goal of routing 988 directly to the National Suicide Prevention and Mental Health Crisis Hotline number, 1-800-273-TALK (8255), 82 area codes must transition to 10-digit dialing (10DD) before the implementation deadline.
The North American Numbering Plan Administrator’s (NANPA) list of area codes required to transition to 10DD has shortened from 87 to 82 due to NANPA removing 3 area codes that are already transitioning to 10-digit dialing due to an overlay and the return of 904-988 and 701-988.
Impacted NPAs
The area codes now required to transition to 10DD are:
| STATE/TERRITORY | NPA(S) |
| Alaska | 907 |
| Alabama | 251 |
| Arkansas | 501 |
| Arizona | 480, 520, 928 |
| California | 209, 530, 562, 626, 650, 707, 925, 949, 951 |
| Colorado | 719, 970 |
| Delaware | 302 |
| Florida | 321 (Brevard County), 352, 561, 941 |
| Georgia | 478, 912 |
| Guam | 671 |
| Hawaii | 808 |
| Illinois | 309, 618, 708 |
| Indiana | 219, 574 |
| Iowa | 319, 515 |
| Kansas | 620, 785 |
| Kentucky | 859 |
| Louisiana | 337, 504 |
| Michigan | 616, 810, 906, 989 |
| Minnesota | 218, 952 |
| Mississippi | 662 |
| Missouri | 314, 417, 660, 816 |
| Montana | 406 |
| Nevada | 775 |
| New Hampshire | 603 |
| New Jersey | 856, 908 |
| New Mexico | 505, 575 |
| New York | 516, 607, 716, 845, 914 |
| North Carolina | 910 |
| Ohio | 440, 513 |
| South Dakota | 605 |
| Tennessee | 731, 865 |
| Texas | 254, 361, 409, 806, 830, 915, 940 |
| Vermont | 802 |
| Virginia | 276, 804 |
| Washington | 509 |
| Wisconsin | 262, 414, 608, 920 |
Milestone Reporting
If your company serves any of the area codes on the NPA transition list, you must meet the following milestones and notify NANPA via 988@somos.com when each milestone is completed. All emails must include: Provider Name, OCN(s), State(s) and NPA(s).
The troubleshooting contact information must include: Provider Name, Primary Contact, Telephone Number(s), Hours of Operation, Backup Contact/Escalations, Email Address and Telephone Number(s).
| Milestone | Milestone Action | Due Date |
| Send first customer notice | Issue first customer education notice
Carriers using bill messages are encouraged to distribute notices for multiple months to help ensure customers are aware of the upcoming dialing changes. |
3/25/2021 |
| Provide carrier contact information | Provide carrier contact information to NANPA for troubleshooting of any permissive 10-digit dialing issues | NOW – 4/10/2021 |
| Implement permissive 10-digit dialing |
Carrier deadline to have permissive 10-digit dialing opened in their networks
Carriers can implement this any time up to this deadline, no need to wait until the night before to implement |
4/24/2021 |
| Send second customer notice | Issue second customer education notice
Carriers using bill messages are encouraged to distribute notices for multiple months to help ensure customers are aware of the upcoming dialing changes. |
9/24/2021 |
| Deadline for 10-digit signaling transition | Carriers should be signaling/sending 10 digits of the called-to party for all calls terminating in all end offices and access tandems in the area code | 9/24/2021 |
| Carrier deadline to implement mandatory 10-digit dialing | Carrier deadline to enforce mandatory 10-digit dialing
Carriers must remove 7-digit dialing and enforce 10-digit dialing |
7/15/2022 |
Please contact Bridget Alexander White or Lisa Cover in JSI’s Maryland office at 301-459-7590 to review the milestones, assist with customer notifications, and to manage your company’s milestone reporting.
Numbering & Porting Essentials Service
Clients interested in educating their staff on the cavalcade of numbering and porting requirements all service providers will face in 2021 should consider subscribing to JSI’s Numbering & Porting Essentials service. The subscription includes breaking news alerts, a free webinar and six web-based education sessions designed to keep companies informed about important numbering, porting and robocall mitigation decisions that will impact their internal operations and customers. Contact Bridget Alexander White for more details and to sign up.