ENP EMERGENCY NUMBER
PROFESSIONAL EXAM CERTIFICATION
REVIEW SET 2026 QUESTIONS WITH
ANSWERS GRADED A+
⫸ Selective Routing
ANI
ALI Answer: Enhanced 911 has what 3 features
⫸ One Nation, One Number Answer: Nena Motto
⫸ Emergency Service Zones - Agency response area determined by
address ESN's are within ESZ areas Answer: ESZ
⫸ Assigned to addresses or cell towers within an Emergency Service
Zone Answer: ESN
⫸ the wireless equivalent of a Central Office Answer: MSC
⫸ a generic term for a phone number that is used for 911 routing
Answer: Psuedo ANI
⫸ Non-callpath Associated Signaling - the PSAP sends back a query
requesting the CB number Answer: NCAS
,⫸ Controlled by the ESN service area; allows one-button transfer to
agencies that support that location in that ESN. Transfer of a call to
police, fire, ems with one-button Answer: Selective Transfer
⫸ Basically a transfer to a fixed number that doesn't change such as
Poison Control Answer: Fixed Transfer
⫸ Secondary PSAP - accomplished by a switch, or a busy signal on 9-1-
1, or damaged equipment resulting in 911 failure Answer: Alternative
Routing
⫸ From one geographic area to another such as from RSO PSAP to San
Bernardino PSAP. Can be in the same Tandum or to another switch
entirely Answer: Router to Router Transfer
⫸ Emergency Services Internet Protocol Network - includes the
network but not the NGCS NG911 Core Services Answer: ESINet
⫸ provides spacial routing to the correct PSAP. Maps a pathway for a
911 call to move from server to server within the ESINet to the correct
PSAP. Utilizes a URI Uniform Resource Identifier to route the call to
the appropriate PSAP Answer: ECRF
⫸ routes call to the next hop routing based on location and 911 policy.
Determines the next hop on the map from the ECRF to the next server.
The terminating ESRP routes the call to the call taker. Answer: ESRP
, ⫸ Location Validation Function - validates a civic address against GIS
data Answer: LVF
⫸ Next Gen Core Services - Includs the ESRP, ECRF, and LVF, IP
Services, core services but not the network Answer: NGCS
⫸ provides location endpoints (calling device) GIS Info and PSAP
Boundaries. Requires and endpoint unique identifier such as an IP
address or a MAC address. *Verifies an address in a voice call for
routing purposes. Answer: LIS
⫸ converts an analog or legacy type call to IP format to be delivered to
NextGen equipment Answer: LNG
⫸ converts an IP call back to analog for legacy PSAPS that do not have
NextGEN equipment Answer: LPG
⫸ The Master Street Address Guide is a listing of all street names and
address ranges
associated with wireline telephones in a given area. The MSAG is used
to associate
addresses and street names in a given MSAG community to an ESN.
The ESN is used
in the Selective Router to send a 9‐1‐1 call to the correct PSAP Answer:
MSAG Purpose
PROFESSIONAL EXAM CERTIFICATION
REVIEW SET 2026 QUESTIONS WITH
ANSWERS GRADED A+
⫸ Selective Routing
ANI
ALI Answer: Enhanced 911 has what 3 features
⫸ One Nation, One Number Answer: Nena Motto
⫸ Emergency Service Zones - Agency response area determined by
address ESN's are within ESZ areas Answer: ESZ
⫸ Assigned to addresses or cell towers within an Emergency Service
Zone Answer: ESN
⫸ the wireless equivalent of a Central Office Answer: MSC
⫸ a generic term for a phone number that is used for 911 routing
Answer: Psuedo ANI
⫸ Non-callpath Associated Signaling - the PSAP sends back a query
requesting the CB number Answer: NCAS
,⫸ Controlled by the ESN service area; allows one-button transfer to
agencies that support that location in that ESN. Transfer of a call to
police, fire, ems with one-button Answer: Selective Transfer
⫸ Basically a transfer to a fixed number that doesn't change such as
Poison Control Answer: Fixed Transfer
⫸ Secondary PSAP - accomplished by a switch, or a busy signal on 9-1-
1, or damaged equipment resulting in 911 failure Answer: Alternative
Routing
⫸ From one geographic area to another such as from RSO PSAP to San
Bernardino PSAP. Can be in the same Tandum or to another switch
entirely Answer: Router to Router Transfer
⫸ Emergency Services Internet Protocol Network - includes the
network but not the NGCS NG911 Core Services Answer: ESINet
⫸ provides spacial routing to the correct PSAP. Maps a pathway for a
911 call to move from server to server within the ESINet to the correct
PSAP. Utilizes a URI Uniform Resource Identifier to route the call to
the appropriate PSAP Answer: ECRF
⫸ routes call to the next hop routing based on location and 911 policy.
Determines the next hop on the map from the ECRF to the next server.
The terminating ESRP routes the call to the call taker. Answer: ESRP
, ⫸ Location Validation Function - validates a civic address against GIS
data Answer: LVF
⫸ Next Gen Core Services - Includs the ESRP, ECRF, and LVF, IP
Services, core services but not the network Answer: NGCS
⫸ provides location endpoints (calling device) GIS Info and PSAP
Boundaries. Requires and endpoint unique identifier such as an IP
address or a MAC address. *Verifies an address in a voice call for
routing purposes. Answer: LIS
⫸ converts an analog or legacy type call to IP format to be delivered to
NextGen equipment Answer: LNG
⫸ converts an IP call back to analog for legacy PSAPS that do not have
NextGEN equipment Answer: LPG
⫸ The Master Street Address Guide is a listing of all street names and
address ranges
associated with wireline telephones in a given area. The MSAG is used
to associate
addresses and street names in a given MSAG community to an ESN.
The ESN is used
in the Selective Router to send a 9‐1‐1 call to the correct PSAP Answer:
MSAG Purpose
