Goto Section: 52.13 | 52.16 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 52.15 Central office code administration.
(a) Central Office Code Administration shall be performed by the NANPA,
or another entity or entities, as designated by the Commission.
(b) Duties of the entity or entities performing central office code
administration may include, but are not limited to:
(1) Processing central office code assignment applications and
assigning such codes in a manner that is consistent with this part;
(2) Accessing and maintaining central office code assignment databases;
(3) Conducting the Numbering Resource Utilization and Forecast (NRUF)
(4) Monitoring the use of central office codes within each area code
and forecasting the date by which all central office codes within that
area code will be assigned; and
(5) Planning for and initiating area code relief, consistent with
(d) Central Office (CO) Code Administration functional requirements.
The NANPA shall manage the United States CO code numbering resource,
including CO code request processing, NPA code relief and jeopardy
planning, and industry notification functions. The NANPA shall perform
its CO Code administration functions in accordance with the published
industry numbering resource administration guidelines and Commission
orders and regulations of 47 CFR chapter I.
(f) Mandatory reporting requirements—(1) Number use categories.
Numbering resources must be classified in one of the following
(i) Administrative numbers are numbers used by telecommunications
carriers to perform internal administrative or operational functions
necessary to maintain reasonable quality of service standards.
(ii) Aging numbers are disconnected numbers that are not available for
assignment to another end user or customer for a specified period of
time. Numbers previously assigned to residential customers may be aged
for no less than 45 days and no more than 90 days. Numbers previously
assigned to business customers may be aged for no less than 45 days and
no more than 365 days.
(iii) Assigned numbers are numbers working in the Public Switched
Telephone Network under an agreement such as a contract or tariff at
the request of specific end users or customers for their use, or
numbers not yet working but having a customer service order pending.
Numbers that are not yet working and have a service order pending for
more than five days shall not be classified as assigned numbers.
(iv) Available numbers are numbers that are available for assignment to
subscriber access lines, or their equivalents, within a switching
entity or point of interconnection and are not classified as assigned,
intermediate, administrative, aging, or reserved.
(v) Intermediate numbers are numbers that are made available for use by
another telecommunications carrier or non-carrier entity for the
purpose of providing telecommunications service to an end user or
customer. Numbers ported for the purpose of transferring an established
customer's service to another service provider shall not be classified
as intermediate numbers.
(vi) Reserved numbers are numbers that are held by service providers at
the request of specific end users or customers for their future use.
Numbers held for specific end users or customers for more than 180 days
shall not be classified as reserved numbers.
(2) Reporting carrier. The term “reporting carrier” refers to a
telecommunications carrier that receives numbering resources from the
NANPA, a Pooling Administrator or another telecommunications carrier.
(3) Data collection procedures. (i) Reporting carriers shall report
utilization and forecast data to the NANPA.
(ii) Reporting shall be by separate legal entity and must include
company name, company headquarters address, Operating Company Number
(OCN), parent company OCN, and the primary type of business in which
the reporting carrier is engaged. The term “parent company” refers to
the highest related legal entity located within the state for which the
reporting carrier is reporting data.
(iii) All data shall be filed electronically in a format approved by
the Common Carrier Bureau.
(4) Forecast data reporting. (i) Reporting carriers shall submit to the
NANPA a five-year forecast of their yearly numbering resource
(ii) In areas where thousands-block number pooling has been
(A) Reporting carriers that are required to participate in
thousands-block number pooling shall report forecast data at the
thousands-block (NXX-X) level per rate center;
(B) Reporting carriers that are not required to participate in
thousands-block number pooling shall report forecast data at the
central office code (NXX) level per rate center.
(iii) In areas where thousands-block number pooling has not been
implemented, reporting carriers shall report forecast data at the
central office code (NXX) level per NPA.
(iv) Reporting carriers shall identify and report separately initial
numbering resources and growth numbering resources.
(5) Utilization data reporting. (i) Reporting carriers shall submit to
the NANPA a utilization report of their current inventory of numbering
resources. The report shall classify numbering resources in the
following number use categories: assigned, intermediate, reserved,
aging, and administrative.
(ii) Rural telephone companies, as defined in the Communications Act of
1934, as amended, 47 U.S.C. 153(37), that provide telecommunications
service in areas where local number portability has not been
implemented shall report utilization data at the central office code
(NXX) level per rate center in those areas.
(iii) All other reporting carriers shall report utilization data at the
thousands-block (NXX-X) level per rate center.
(6) Reporting frequency. (i) Reporting carriers shall file forecast and
utilization reports semi-annually on or before February 1 for the
preceding reporting period ending on December 31, and on or before
August 1 for the preceding reporting period ending on June 30.
Mandatory reporting shall commence August 1, 2000.
(ii) State commissions may reduce the reporting frequency for NPAs in
their states to annual. Reporting carriers operating in such NPAs shall
file forecast and utilization reports annually on or before August 1
for the preceding reporting period ending on June 30, commencing August
(iii) A state commission seeking to reduce the reporting frequency
pursuant to paragraph (f) (6)(ii) of this section shall notify the
Wireline Competition Bureau and the NANPA in writing prior to reducing
the reporting frequency.
(7) Access to data and confidentiality—States shall have access to data
reported to the NANPA provided that they have appropriate protections
in place to prevent public disclosure of disaggregated,
(8) Reports of Permanently Disconnected Numbers—Reporting carriers must
report information regarding NANP numbers in accordance with
§ 64.1200(l) of this title.
(g) Applications for numbering resources—
(1) General requirements. An applicant for numbering resources must
include in its application the applicant's company name, company
headquarters address, OCN, parent company's OCN(s), and the primary
type of business in which the numbering resources will be used.
(2) Initial numbering resources. An applicant for initial numbering
resources must include in its application evidence that the applicant
is authorized to provide service in the area for which the numbering
resources are requested; and that the applicant is or will be capable
of providing service within sixty (60) days of the numbering resources
activation date. A provider of VoIP Positioning Center (VPC) services
that is unable to demonstrate authorization to provide service in a
state may instead demonstrate that the state does not certify VPC
service providers in order to request pseudo-Automatic Numbering
Identification (p-ANI) codes directly from the Numbering Administrators
for purposes of providing 911 and E-911 service.
(3) Commission authorization process. A provider of interconnected VoIP
service may show a Commission authorization obtained pursuant to this
paragraph as evidence that it is authorized to provide service under
paragraph (g)(2) of this section.
(i) Contents of the application for interconnected VoIP provider
numbering authorization. An application for authorization must
reference this section and must contain the following:
(A) The applicant's name, address, and telephone number, and contact
information for personnel qualified to address issues relating to
regulatory requirements, compliance with Commission's rules, 911, and
(B) An acknowledgment that the authorization granted under this
paragraph is subject to compliance with applicable Commission numbering
rules; numbering authority delegated to the states; and industry
guidelines and practices regarding numbering as applicable to
(C) An acknowledgement that the applicant must file requests for
numbers with the relevant state commission(s) at least 30 days before
requesting numbers from the Numbering Administrators;
(D) Proof that the applicant is or will be capable of providing service
within sixty (60) days of the numbering resources activation date in
accordance with paragraph (g)(2) of this section;
(E) Certification that the applicant complies with its Universal
Service Fund contribution obligations under 47 CFR part 54, subpart H,
its Telecommunications Relay Service contribution obligations under 47
CFR 64.604(c)(5)(iii), its NANP and LNP administration contribution
obligations under 47 CFR 52.17 and 52.32, its obligations to pay
regulatory fees under 47 CFR 1.1154, and its 911 obligations under 47
CFR part 9; and
(F) Certification that the applicant possesses the financial,
managerial, and technical expertise to provide reliable service. This
certification must include the name of applicant's key management and
technical personnel, such as the Chief Operating Officer and the Chief
Technology Officer, or equivalent, and state that none of the
identified personnel are being or have been investigated by the Federal
Communications Commission or any law enforcement or regulatory agency
for failure to comply with any law, rule, or order; and
(G) Certification pursuant to Sections 1.2001 and 1.2002 of this
chapter that no party to the application is subject to a denial of
Federal benefits pursuant to section 5301 of the Anti-Drug Abuse Act of
1988. See 21 U.S.C. 862.
(ii) An applicant for Commission authorization under this section must
file its application electronically through the “Submit a Non-Docketed
Filing” module of the Commission's Electronic Comment Filing System
(ECFS). Once the Commission reviews the application and assigns a
docket number, the applicant must make all subsequent filings relating
to its application in this docket. Parties may file comments addressing
an application for authorization no later than 15 days after the
Commission releases a public notice stating that the application has
been accepted for filing, unless the public notice specifies a
different filing date.
(iii) An application under this section is deemed granted by the
Commission on the 31st day after the Commission releases a public
notice stating that the application has been accepted for filing,
unless the Wireline Competition Bureau (Bureau) notifies the applicant
that the grant will not be automatically effective. The Bureau may halt
this auto-grant process if;
(A) An applicant fails to respond promptly to Commission inquiries,
(B) An application is associated with a non-routine request for waiver
of the Commission's rules,
(C) Timely-filed comments on the application raise public interest
concerns that require further Commission review, or
(D) The Bureau determines that the application requires further
analysis to determine whether granting the application serves the
public interest. The Commission reserves the right to request
additional information after its initial review of an application.
(iv) Conditions applicable to all interconnected VoIP provider
numbering authorizations. An interconnected VoIP provider authorized to
request numbering resources directly from the Numbering Administrators
under this section must adhere to the following requirements:
(A) Maintain the accuracy of all contact information and certifications
in its application. If any contact information or certification is no
longer accurate, the provider must file a correction with the
Commission and each applicable state within thirty (30) days of the
change of contact information or certification. The Commission may use
the updated information or certification to determine whether a change
in authorization status is warranted;
(B) Comply with the applicable Commission numbering rules; numbering
authority delegated to the states; and industry guidelines and
practices regarding numbering as applicable to telecommunications
(C) File requests for numbers with the relevant state commission(s) at
least thirty (30) days before requesting numbers from the Numbering
(D) Provide accurate regulatory and numbering contact information to
each state commission when requesting numbers in that state.
(4) Growth numbering resources. (i) Applications for growth numbering
resources shall include:
(A) A Months-to-Exhaust Worksheet that provides utilization by rate
center for the preceding six months and projected monthly utilization
for the next twelve (12) months; and
(B) The applicant's current numbering resource utilization level for
the rate center in which it is seeking growth numbering resources.
(ii) The numbering resource utilization level shall be calculated by
dividing all assigned numbers by the total numbering resources in the
applicant's inventory and multiplying the result by 100. Numbering
resources activated in the Local Exchange Routing Guide (LERG) within
the preceding 90 days of reporting utilization levels may be excluded
from the utilization calculation.
(iii) All service providers shall maintain no more than a six-month
inventory of telephone numbers in each rate center or service area in
which it provides telecommunications service.
(iv) The NANPA shall withhold numbering resources from any U.S. carrier
that fails to comply with the reporting and numbering resource
application requirements established in this part. The NANPA shall not
issue numbering resources to a carrier without an OCN. The NANPA must
notify the carrier in writing of its decision to withhold numbering
resources within ten (10) days of receiving a request for numbering
resources. The carrier may challenge the NANPA's decision to the
appropriate state regulatory commission. The state commission may
affirm or overturn the NANPA's decision to withhold numbering resources
from the carrier based on its determination of compliance with the
reporting and numbering resource application requirements herein.
(5) Non-compliance. The NANPA shall withhold numbering resources from
any U.S. carrier that fails to comply with the reporting and numbering
resource application requirements established in this part. The NANPA
shall not issue numbering resources to a carrier without an Operating
Company Number (OCN). The NANPA must notify the carrier in writing of
its decision to withhold numbering resources within ten (10) days of
receiving a request for numbering resources. The carrier may challenge
the NANPA's decision to the appropriate state regulatory commission.
The state commission may affirm, or may overturn, the NANPA's decision
to withhold numbering resources from the carrier based on its
determination that the carrier has complied with the reporting and
numbering resource application requirements herein. The state
commission also may overturn the NANPA's decision to withhold numbering
resources from the carrier based on its determination that the carrier
has demonstrated a verifiable need for numbering resources and has
exhausted all other available remedies.
(6) State access to applications. State regulatory commissions shall
have access to service provider's applications for numbering resources.
The state commissions should request copies of such applications from
the service providers operating within their states, and service
providers must comply with state commission requests for copies of
numbering resource applications. Carriers that fail to comply with a
state commission request for numbering resource application materials
shall be denied numbering resources.
(h) National utilization threshold. All applicants for growth numbering
resources shall achieve a 60% utilization threshold, calculated in
accordance with paragraph (g)(3)(ii) of this section, for the rate
center in which they are requesting growth numbering resources. This
60% utilization threshold shall increase by 5% on June 30, 2002, and
annually thereafter until the utilization threshold reaches 75%.
(i) Reclamation of numbering resources. (1) Reclamation refers to the
process by which service providers are required to return numbering
resources to the NANPA or the Pooling Administrator.
(2) State commissions may investigate and determine whether service
providers have activated their numbering resources and may request
proof from all service providers that numbering resources have been
activated and assignment of telephone numbers has commenced.
(3) Service providers may be required to reduce contamination levels to
facilitate reclamation and/or pooling.
(4) State commissions shall provide service providers an opportunity to
explain the circumstances causing the delay in activating and
commencing assignment of their numbering resources prior to initiating
(5) The NANPA and the Pooling Administrator shall abide by the state
commission's determination to reclaim numbering resources if the state
commission is satisfied that the service provider has not activated and
commenced assignment to end users of their numbering resources within
six months of receipt.
(6) The NANPA and Pooling Administrator shall initiate reclamation
within sixty days of expiration of the service provider's applicable
(7) If a state commission declines to exercise the authority delegated
to it in this paragraph, the entity or entities designated by the
Commission to serve as the NANPA shall exercise this authority with
respect to NXX codes and the Pooling Administrator shall exercise this
authority with respect to thousands-blocks. The NANPA and the Pooling
Administrator shall consult with the Wireline Competition Bureau prior
to exercising the authority delegated to it in this provision.
(j) Sequential number assignment. (1) All service providers shall
assign all available telephone numbers within an opened thousands-block
before assigning telephone numbers from an uncontaminated
thousands-block, unless the available numbers in the opened
thousands-block are not sufficient to meet a specific customer request.
This requirement shall apply to a service provider's existing numbering
resources as well as any new numbering resources it obtains in the
(2) A service provider that opens an uncontaminated thousands-block
prior to assigning all available telephone numbers within an opened
thousands-block should be prepared to demonstrate to the state
(i) A genuine request from a customer detailing the specific need for
telephone numbers; and
(ii) The service provider's inability to meet the specific customer
request for telephone numbers from the available numbers within the
service provider's opened thousands-blocks.
(3) Upon a finding by a state commission that a service provider
inappropriately assigned telephone numbers from an uncontaminated
thousands-block, the NANPA or the Pooling Administrator shall suspend
assignment or allocation of any additional numbering resources to that
service provider in the applicable NPA until the service provider
demonstrates that it does not have sufficient numbering resources to
meet a specific customer request.
(k) Numbering audits. (1) All telecommunications service providers
shall be subject to “for cause” and random audits to verify carrier
compliance with Commission regulations and applicable industry
guidelines relating to numbering administration.
(2) The Enforcement Bureau will oversee the conduct and scope of all
numbering audits conducted under the Commission's jurisdiction, and
determine the audit procedures necessary to perform the audit.
Numbering audits performed by independent auditors pursuant to this
section shall be conducted in accordance with generally accepted
auditing standards and the American Institute of Certified Public
Accountants' standards for compliance attestation engagements, as
supplemented by the guidance and direction of the Chief of the
(3) Requests for “for cause” audits shall be forwarded to the Chief of
the Enforcement Bureau, with a copy to the Chief of the Common Carrier
Bureau. Requests must state the reason for which a “for cause” audit is
being requested and include documentation of the alleged anomaly,
inconsistency, or violation of the Commission rules or orders or
applicable industry guidelines. The Chief of the Enforcement Bureau
will provide carriers up to 30 days to provide a written response to a
request for a “for cause” audit.
[ 61 FR 47353 , Sept. 6, 1996, as amended at 62 FR 55182 , Oct. 23, 1997;
65 FR 37707 , June 16, 2000; 66 FR 9531 , Feb. 8, 2001; 67 FR 6434 , Feb.
12, 2002; 67 FR 13226 , Mar. 21, 2002; 68 FR 25843 , May 14, 2003; 71 FR 65750 , Nov. 9, 2006; 80 FR 66479 , Oct. 29, 2015; 84 FR 11232 , Mar. 26,
Goto Section: 52.13 | 52.16
Goto Year: 2020 |
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