Goto Section: 52.5 | 52.9 | Table of Contents
Revised as of January 19, 2021
Goto Year:2020 |
§ 52.7 Definitions.
As used in this subpart:
(a) Area code or numbering plan area (NPA). The term “area code or
numbering plan area” refers to the first three digits (NXX) of a
ten-digit telephone number in the form NXX-NXX-XXXX, where N represents
any one of the numbers 2 through 9 and X represents any one of the
numbers 0 through 9.
(b) Area code relief. The term “area code relief” refers to the process
by which central office codes are made available when there are few or
no unassigned central office codes remaining in an existing area code
and a new area code is introduced. Area code relief includes planning
for area code “jeopardy,” which is a situation where central office
codes may become exhausted before an area code relief plan can be
(c) Central office (CO) code. The term “central office code” refers to
the second three digits (NXX) of a ten-digit telephone number in the
form NXX-NXX-XXXX, where N represents any one of the numbers 2 through
9 and X represents any one of the numbers 0 through 9.
(d) Central office (CO) code administrator. The term “central office
code administrator” refers to the entity or entities responsible for
managing central office codes in each area code.
(e) North American Numbering Plan Administrator (NANPA). The term
“North American Numbering Plan Administrator” refers to the entity or
entities responsible for managing the NANP.
(f) Billing and Collection Agent. The term “Billing & Collection Agent”
(“B&C Agent”) refers to the entity responsible for the collection of
funds to support numbering administration for telecommunications
services from the United States telecommunications industry and NANP
(g) Pooling Administrator (PA). The term “Pooling Administrator” refers
to the entity or entities responsible for administering a
thousands-block number pool.
(h) Contamination. Contamination occurs when at least one telephone
number within a block of telephone numbers is not available for
assignment to end users or customers. For purposes of this provision, a
telephone number is “not available for assignment” if it is classified
as administrative, aging, assigned, intermediate, or reserved as
defined in § 52.15(f)(1).
(i) Donation. The term “donation” refers to the process by which
carriers are required to contribute telephone numbers to a
thousands-block number pool.
(j) Inventory. The term “inventory” refers to all telephone numbers
distributed, assigned or allocated:
(1) To a service provider; or
(2) To a pooling administrator for the purpose of establishing or
maintaining a thousands-block number pool.
[ 61 FR 47353 , Sept. 6, 1996, as amended at 62 FR 55180 , Oct. 23, 1997;
65 FR 37707 , June 16, 2000]
Goto Section: 52.5 | 52.9
Goto Year: 2020 |
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