ABEC Alternate Billing Entity Code
ACNA Access Customer Name Abbreviation
AOCN Administrative Operating Company Number. The term "AOCN" also refers to the company that updates rating and routing information associated with central office code assignments.
ANI Automatic Number Identification
ANSI American National Standards Institute
ATIS Alliance for Telecommunications Industry Solutions (
BIRRDS Business Integrated Routing and Rating System
CIC Carrier Identification Code
CIGRR Common Interest Group on Rating and Routing
CLEC Competitive Local Exchange Carrier
CLLI™ COMMON LANGUAGE® Location Identification
CLONES™ Central Location ON-line Entry System
CO Central Office
COCAG Central Office Code Assignment Guidelines
EN Emergency Notification
ERC Easily recognizable (area) code
FCC Federal Communications Commission
FG A,B,C,D Feature Group A, B, C, D
FNPA Foreign NPA
FRN FCC Registration Number
ILEC Incumbent Local Exchange Carrier
INC Industry Numbering Committee
IPD Initial Planning Document
IXC Interexchange Carrier
LATA Local Access and Transport Area
LEC Local Exchange Carrier
LIDB Line Information Data Base
LNP Local Number Portability
LRN Location Routing Number
MSA Metropolitan Statistical Area
MTE Months to Exhaust
MTSO Mobile Telephone Switching Office
NANC North American Numbering Council
NANP North American Numbering Plan
NANPA North American Numbering Plan Administrator
NARUC National Association of Regulatory Utility Commissions
NAS NANP Administration System
NASC Number Administration Service Center (Toll-Free 800/866/877/888 database)
NGIIF Next Generation Interconnection Interoperability Forum
NOWG Number Oversight Working Group, a subgroup of the NANC
NPA Numbering Plan Area (Area Code)
NPAC Number Portability Administration Center
NRO Number Resource Optimization
NRRIC Network Rating and Routing Information Committee
NRUF Numbering Resource Utilization Forecast
NXX The format of an NPA code or a central office code (N=2-9, X=0-9)
OBF Ordering and Billing Forum
OCN Operating Company Number
PA Pooling Administrator
PCS Personal Communications Service
PSAP Public Safety Answering Point
PSC Public Service Commission
PSTN Public Switched Telephone Network
PUC Public Utilities Commission
RA Rate Area
RC Rate Center
RCC Rate Center Consolidation
SAC Service Access Code
SP Service Provider
STP Signaling Transfer Point
TN Telephone Number
TPM™ Terminating Point Master
TRA Telecom Routing Administration
V&H Vertical & Horizontal (Coordinates)
VoIP Voice over Internet Protocol
VSC Vertical Service Code

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