LNG
for
NG 9-1-1/ NG 1-1-2
Realization of IETF Standards
for the operational use
in a Legacy Network Gateway
for
Next Generation Emergency Communication Centers
Gregor Jänin, ENP
5/13/10
Background
• Work being done:
• Detailed Functional and Interface Specification
for the NENAi3 Solution- Stage3 (Chapter 7)
based on ideas from Theresa Reese (Telcordia)
• Plans towards pure IP systems, and the truth
• Studies for a master thesis
• requests from the PSAP’s
• need of a LNG as COTS product
Big Picture
Clients
Access Networks
Emergency Services IP Network (ESInet) Domains
Origination Networks
Government
Services
Legacy PSAP/Emergency
Responders
Legacy PSAP
Gateway
IM Clients
LISs
CSP
Call Server
Multimedia
Services
Public Web
Services
DNS
NG9-1-1 (i3) PSAP
ESInet
SIP/H.323
Originating
Border Control
Global Internet,
Private Networks
or IMS
Public Access
IP Networks
ESInet
clients
E-CSCF
(IMS) Location Validation
Web Interface
ECR
Web
Interfaces
Originating
ESRP
Terminating
Border Control
Legacy
Network
Gateway
Wireless/IP
Client
Emergency Call Routing &
Location Validation
Databases
Terminating
ESRP
Private Web
Services
Supplemental
Services
Databases
NG9-1-1 (i3) PSAP
Legacy CircuitSwitched Networks
PSTN client
Wireless/CS
Client
“NG-911” at the moment
IP Network of
Telecoms
(VoIP)
pure wire
circuit switched
connection
ANI/ALI
request
PSAP
IP Network
(VoIP)
ESInet, what’s the right way
?
Standard
PSTN 2 VoIP
Gateway
Gateway overview
placing a Gateway now
• using a standard PSTN 2 VoIP gateway
Job of a LNG
Discovering & Calling
a PSAP with ECRIT
Client
DHCP/DNS
Server
Location
Information
Server
LoST
Server
PSAP
DHCP INFORM
access domain
H
E
L
D
DNS NAPTR
(access domain)
at initial start of LNG
LIS URI
HELD
with every call
location
E
C
R
I
T
LoST (location)
PSAP URI
connect
i3 defined LNG-Functions
• PIF
Protocol Interwork Function
• NIF
NG 9-1-1 / 1-1-2 Specific
Interwork Function
• LIF
Location Interwork Function
looking inside a LNG
PIF





Protocol Interwork Function
Legacy Interfaces(circuit switched)
Ethernet IP interfaces (“legacy” side)
Border Control Function (BCF)
NG 911 Specific Interwork Funct. (NIF)
Ethernet IP interfaces (ESInet side)
NG 112/911




spec. Interwork Function
PIF (receiving call information)
LIF
ECRF
PIF (delivering processed call information)
LIF
Protocol Interwork Function
 connection to individual LIS
 using HELD
CAMA
vs.
ISDN
Data for lookup available
(with ISDN )
Result with CAMA: delay of call setup
possible scenario with CAMA
 best effort call forward
also used if LIS does not respond in time!
outgoing call via LNG LPG
• works as Legacy PSAP Gateway
• handover to other ESInet
• Standard Call Gateway
pure IP- world
in the US  2020 ???
in the EU 2025 ???
Q & A ??
thanks for staying awake..
contact:
Gregor Jänin, ENP
+43 664 357 3632 (GMT+2)
gregor.jaenin@dispo.net
for Questions about 112 Operations Committee
gj@eena.org