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Wireless E911 Guide CG-EWCG-001
Overview of E911 Issue 3, January 6, 2004
Table B Glossary of Terms (continued)
Term Definition
E911 Tandem Central
Office Switch
The central office designated for a geographical area to receive end
office E911 calls and route to the appropriate PSAP.
Emergency Service
Number (ESN)
A number associated with the geographical area served by the same
fire, police and ambulance districts.
Emergency Service
Routing Digits
(ESRD)
See ANI or pANI
End Office The central office switch receiving E911 calls from subscribers.
For wireless, this would be the MSC.
FCC Federal Communications Commission
FOC Function of Change
GMLC (see MPC)
ICO Independent Telephone Company
Integrated Services
Digital Network User
Part (ISUP)
A message protocol to support call set up and release for interoffice
voice call connections over SS7 signaling.
Intrado A vendor designated by BST to handle E911 data maintenance
(formerly SCC)
LOC Location
Master Street Address
Guide (MSAG)
All street data, including street names, address ranges and ESNs
used to validate incoming telephone number data for provisioning
of selective routing.
Mobile Position Center
(MPC)
The network entity that provides phase 2 location information to
the ALI database over an E2 interface. For the purposes of this
document, MPC and GMLC are considered equivalent although a
GMLC is unique to the GSM environment.
Mobile Switching
Center (MSC)
Wireless equivalent of an End Office, which provides switching
functions from wireless calls.
National Emergency
Number Association
(NENA)
A professional association of 9-1-1 emergency number entities
responsible for the planning, implementation, management and
administration of national emergency number issues.
NPA
The area code of the telephone number.
NRF
No Record Found
NXX
The first three(3) digits of a telephone number following the NPA.
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